US Robotics COURIER User Manual

U.S. Robotics I -modem Command Reference page i U.S. Robotics I -modem Command Reference

U.S. Robotics I -modem Command Reference Using the AT Command Set • Page 1-1 Chapter 1Using the AT Command Set I-modems are controlled using AT comm

U.S. Robotics I-modem Command ReferenceDial Security • Page 9-17ConÞguring Dial Security RemotelyThe host administrator can conÞgure the hostÕs securi

U.S. Robotics I-modem Command ReferenceDial Security • Page 9-184. To end the remote session and reactivate Dial Security on the host, reset the guest

U.S. Robotics I-modem Command ReferenceFlow Control • Page 10-1Chapter 10Flow ControlThe I-modem has two buffers, one for data transmitted from your c

U.S. Robotics I-modem Command ReferenceFlow Control • Page 10-2Hardware and Software Flow ControlHardware Flow ControlI-modems implement hardware ßow

U.S. Robotics I-modem Command ReferenceFlow Control • Page 10-3If you use software ßow control and are transferring non-text (binary) Þles or using an

U.S. Robotics I-modem Command ReferenceFlow Control • Page 10-4&R0 After sending the Request to Send (RTS) signal, pause before sending CTS. The d

U.S. Robotics I-modem Command ReferenceFlow Control • Page 10-5Keep in mind that the XON/XOFF characters sent to the remote computer may interfere wit

U.S. Robotics I-modem Command ReferenceFlow Control • Page 10-6&I4 Hewlett PackardÐTerminal mode. Applies only to I-modems attached to terminals i

U.S. Robotics I-modem Command ReferenceFlow Control • Page 10-7and preventing their own deviceÕs buffer from overßowing. At the com-puter/device inter

U.S. Robotics I-modem Command ReferenceFlow Control • Page 10-8&H3 Use both hardware and software ßow control. If you are unsure about what your e

U.S. Robotics I -modem Command Reference Using the AT Command Set • Page 1-2 ¥ You can leave zeros off commands because a missing numeric parameter

U.S. Robotics I-modem Command ReferenceHandshaking, Error Control, Data Compression, and Throughput • Page 11-1Chapter 11Handshaking, Error Control,Da

U.S. Robotics I-modem Command ReferenceHandshaking, Error Control, Data Compression, and Throughput • Page 11-2Universal ConnectWhen you set the I-mod

U.S. Robotics I-modem Command ReferenceHandshaking, Error Control, Data Compression, and Throughput • Page 11-3By default, In-band Monitoring is activ

U.S. Robotics I-modem Command ReferenceHandshaking, Error Control, Data Compression, and Throughput • Page 11-4By default, the I-modem tries to establ

U.S. Robotics I-modem Command ReferenceHandshaking, Error Control, Data Compression, and Throughput • Page 11-5V.120 Rate AdaptationIf you set the I-m

U.S. Robotics I-modem Command ReferenceHandshaking, Error Control, Data Compression, and Throughput • Page 11-6the highest compatible modulation schem

U.S. Robotics I-modem Command ReferenceHandshaking, Error Control, Data Compression, and Throughput • Page 11-7connection. If the remote analog device

U.S. Robotics I-modem Command ReferenceHandshaking, Error Control, Data Compression, and Throughput • Page 11-8¥ V.32terbo: 19.2 Kbps, with an additio

U.S. Robotics I-modem Command ReferenceHandshaking, Error Control, Data Compression, and Throughput • Page 11-9instance that this may be necessary. (S

U.S. Robotics I-modem Command ReferenceHandshaking, Error Control, Data Compression, and Throughput • Page 11-10If you want the I-modem connect with V

U.S. Robotics I -modem Command Reference Using the AT Command Set • Page 1-3 A> Repeat the last-issued command until canceled by pressing any key

U.S. Robotics I-modem Command ReferenceHandshaking, Error Control, Data Compression, and Throughput • Page 11-11Error control is available for calls a

U.S. Robotics I-modem Command ReferenceHandshaking, Error Control, Data Compression, and Throughput • Page 11-12¥ A Link Access Procedures for Modems

U.S. Robotics I-modem Command ReferenceHandshaking, Error Control, Data Compression, and Throughput • Page 11-13 Error-Control Commands&Mn Enable

U.S. Robotics I-modem Command ReferenceHandshaking, Error Control, Data Compression, and Throughput • Page 11-14&M6 Start V.25bis synchronous mode

U.S. Robotics I-modem Command ReferenceHandshaking, Error Control, Data Compression, and Throughput • Page 11-15AnalogIf an I-modem successfully estab

U.S. Robotics I-modem Command ReferenceHandshaking, Error Control, Data Compression, and Throughput • Page 11-16Possible dictionary sizes:I-modems use

U.S. Robotics I-modem Command ReferenceHandshaking, Error Control, Data Compression, and Throughput • Page 11-17This allows V.42bis compression to wor

U.S. Robotics I-modem Command ReferenceHandshaking, Error Control, Data Compression, and Throughput • Page 11-18Getting Maximum ThroughputThe followin

U.S. Robotics I-modem Command ReferenceHandshaking, Error Control, Data Compression, and Throughput • Page 11-19¥ MNP5 compression is disabled for Þle

U.S. Robotics I-modem Command ReferenceHandshaking, Error Control, Data Compression, and Throughput • Page 11-20The protocols listed above further red

U.S. Robotics I -modem Command Reference Using the AT Command Set • Page 1-4 Displaying S-register Settings All S-registers To display the S-registe

U.S. Robotics I-modem Command ReferenceQuerying • Page 12-1Chapter 12QueryingEach channel in the multiport I-modem can display information such as the

U.S. Robotics I-modem Command ReferenceQuerying • Page 12-2I1 Perform a checksum of the I-modemÕs read-only memory (ROM) and dis-play the results. (Th

U.S. Robotics I-modem Command ReferenceQuerying • Page 12-3 S08=002 S09=006 S10=007 S11=055 S12=050 S13=000 S14=000 S15=000 S16=000 S17=00

U.S. Robotics I-modem Command ReferenceQuerying • Page 12-4 BAUD=115200 PARITY=N WORDLEN=8 &A3 &B1 &C1 &D2 &G0 &H1

U.S. Robotics I-modem Command ReferenceQuerying • Page 12-5I6 Display a diagnostic summary. During a connection, the I-modem monitors and stores infor

U.S. Robotics I-modem Command ReferenceQuerying • Page 12-6Fallback DisabledProtocol SYNCSpeed 64000La

U.S. Robotics I-modem Command ReferenceQuerying • Page 12-7Data Compres-sionIndicates the type of data compres-sion negotiated for the call (V42BIS or

U.S. Robotics I-modem Command ReferenceQuerying • Page 12-8Disconnect ReasonsTable 12-2 explains the disconnect reasons that are displayed in the ATI6

U.S. Robotics I-modem Command ReferenceQuerying • Page 12-9Call rejected The device you tried to call refused to accept the call, and it is not busy o

U.S. Robotics I-modem Command ReferenceQuerying • Page 12-10GSTN (General Switch Tele-phone Network) Clear DownThe connection was non-ARQ, and DTR was

U.S. Robotics I-modem Command ReferenceUsing the AT Command Set • Page 1-5 Setting an S-registerTo change a setting for an S-register in the current

U.S. Robotics I-modem Command ReferenceQuerying • Page 12-11Interworking class, unspeciÞedYour call went through a network that cannot provide message

U.S. Robotics I-modem Command ReferenceQuerying • Page 12-12Loss of carrier The I-modem detected a loss of the remote deviceÕs carrier and waited the

U.S. Robotics I-modem Command ReferenceQuerying • Page 12-13No user respondingThe user has not responded to the call with either an ALERT or CONNectin

U.S. Robotics I-modem Command ReferenceQuerying • Page 12-14Requested channel not availableThe channel you requested is not available: itÕs engaged or

U.S. Robotics I-modem Command ReferenceQuerying • Page 12-15Service or option not avail-able, unspeci-ÞedA Òservice or option not availableÓ event occ

U.S. Robotics I-modem Command ReferenceQuerying • Page 12-16User busy Though the userÕs equipment is compatible with the call, it has no resources to

U.S. Robotics I-modem Command ReferenceQuerying • Page 12-17Disconnect Reasons for Dial SecurityI7 Display the product conÞguration. If you have a pro

U.S. Robotics I-modem Command ReferenceQuerying • Page 12-18 I10 Display the Dial Security Account status. For security administrators only, unless lo

U.S. Robotics I-modem Command ReferenceQuerying • Page 12-19I11 Displays a connection report that U.S. Robotics Technical Support repre-sentatives use

U.S. Robotics I-modem Command ReferenceDisplaying Help Screens • Page 13-1Chapter 13Displaying Help ScreensMultiport I-modems provide six help, or com

U.S. Robotics I-modem Command ReferenceUsing the AT Command Set • Page 1-6Bit-Mapped S-registersUnderstanding Bit-Mapped S-registersCertain registers

U.S. Robotics I-modem Command ReferenceDisplaying Help Screens • Page 13-2Basic Command Set ($)When you send AT$, the I-modem displays a screen that s

U.S. Robotics I-modem Command ReferenceDisplaying Help Screens • Page 13-3Fn n=0 Online Echo Sr=n Sets Register "r" to &

U.S. Robotics I-modem Command ReferenceDisplaying Help Screens • Page 13-4at&$HELP, Ampersand Commands (CTRL-S to Stop, CTRL-C to Cancel)&An

U.S. Robotics I-modem Command ReferenceDisplaying Help Screens • Page 13-5 n=3 HP Enq/Ack Host Mode n=3 Nondest./Unexpedited

U.S. Robotics I-modem Command ReferenceDisplaying Help Screens • Page 13-6 n=14 28800 bps n=15 31200 bps n=16 33600 bpsOK Figure 13-2.

U.S. Robotics I-modem Command ReferenceDisplaying Help Screens • Page 13-7S7 Wait Time/Carrier (sec) 1 = MNP/V.42 Disabled in V.22S8

U.S. Robotics I-modem Command ReferenceDisplaying Help Screens • Page 13-8 2 = Dial Test 4 = Disable 32S-2D trellis code

U.S. Robotics I-modem Command ReferenceDisplaying Help Screens • Page 13-9S30 Reserved 2 = Disable EnhancedS31 Reserve

U.S. Robotics I-modem Command ReferenceDisplaying Help Screens • Page 13-10Percent Command Set (%$)When you send AT%$, the I-modem displays a screen t

U.S. Robotics I-modem Command ReferenceDisplaying Help Screens • Page 13-11 n=6 9600 bps n=8 14400 bps n=7 19200 bp

U.S. Robotics I-modem Command ReferenceUsing the AT Command Set • Page 1-7 Each bit can also be assigned a value corresponding to its number:Convertin

U.S. Robotics I-modem Command ReferenceDisplaying Help Screens • Page 13-12at*$HELP, Asterisk Commands (CTRL-S to Stop, CTRL-C to Cancel)*S1=n..n Voi

U.S. Robotics I-modem Command ReferenceDisplaying Help Screens • Page 13-13*T1=nn Voice channel TEI nn=0 Automatic assignment

U.S. Robotics I-modem Command ReferenceDisplaying Help Screens • Page 13-140-9 Digits to Dial* Auxiliary Tone Dial Digit# Auxiliary Tone Dial Digi

U.S. Robotics I-modem Command ReferenceTesting • Page 14-1Chapter 14TestingThe I-modem can perform digital and remote digital loopback tests. You can

U.S. Robotics I-modem Command ReferenceTesting • Page 14-2Testing the I-modem (Using &T)Perform digital loopback and remote digital loopback testi

U.S. Robotics I-modem Command ReferenceTesting • Page 14-31. Send the command AT&M0&N3S14.0=0 to prepare the I-modem for testing.This command

U.S. Robotics I-modem Command ReferenceTesting • Page 14-47. Send AT&M4, unless you used a reset command (ATZ or ATZ!). Stopping a Test (&T0,

U.S. Robotics I-modem Command ReferenceTesting • Page 14-5Remote Digital Loopback Testing (&T6, &T7)This test, like the local digital loopback

U.S. Robotics I-modem Command ReferenceTesting • Page 14-6Granting a Digital Loopback Test Request (&T4)The &T4 option causes the I-modem to g

U.S. Robotics I-modem Command ReferenceTesting • Page 14-74. Send the I-modem the AT&T6 com-mand. The I-modem enters remote digital loopback mode,

U.S. Robotics I-modem Command ReferenceUsing the AT Command Set • Page 1-8HereÕs an example of how bits are converted to decimal values:01001111Conver

U.S. Robotics I-modem Command ReferenceTesting • Page 14-8You don't need to type anything during this test. The I-modem sends only its Þnal error

U.S. Robotics I-modem Command ReferenceTesting • Page 14-9Register S18, the I-modem automatically ends the test when the test timeout is reached.When

U.S. Robotics I-modem Command ReferenceTesting • Page 14-10setting instead. To perform remote digital loopback testing with a U.S.Robotics modem that

U.S. Robotics I-modem Command ReferenceTesting • Page 14-11tal loopback mode. If you are using an external I-modem, the MR status light ßashes during

U.S. Robotics I-modem Command ReferenceTesting • Page 14-12To use the test pattern during testing with S16, type the following command: AT&M0S16=1

U.S. Robotics I-modem Command ReferenceTroubleshooting • Page 15-1Chapter 15TroubleshootingThis chapter is divided into three sections:1. Problems tha

U.S. Robotics I-modem Command ReferenceTroubleshooting • Page 15-2¥ Be sure your communications software is set to the correct bit rate and word lengt

U.S. Robotics I-modem Command ReferenceTroubleshooting • Page 15-3The I-modem wonÕt accept your directory number (DN)The I-modem accepts only seven-di

U.S. Robotics I-modem Command ReferenceTroubleshooting • Page 15-4The I-modem wonÕt dialCheck your communications softwareÕs manual to Þnd out which D

U.S. Robotics I-modem Command ReferenceTroubleshooting • Page 15-5The I-modem behaves as if <Enter> were pressed when you donÕt press any keysYo

U.S. Robotics I-modem Command ReferenceUsing the AT Command Set • Page 1-9Setting Bit-Mapped S-registersYou can set bit-mapped S-registers using eithe

U.S. Robotics I-modem Command ReferenceTroubleshooting • Page 15-6If the I-modem is set to a Þxed serial port rate (&B1) and your software is Þxed

U.S. Robotics I-modem Command ReferenceTroubleshooting • Page 15-7Connects at 64 Kbps or 56 Kbps, but canÕt pass dataYour telephone company may be pro

U.S. Robotics I-modem Command ReferenceTroubleshooting • Page 15-8Bad faxes or canÕt fax¥ Make sure the fax software is set to use Class 1 fax. Refer

U.S. Robotics I-modem Command ReferenceTroubleshooting • Page 15-9¥ Make sure your I-modem's connection rate setting, &Nn, is correct for the

U.S. Robotics I-modem Command ReferenceTroubleshooting • Page 15-10If You Still Have ProblemsThe problems described above are the most common ones use

U.S. Robotics I-modem Command ReferenceTroubleshooting • Page 15-11b. Be sure to include your SRO number inside the package, along with your name and

U.S. Robotics I-modem Command ReferenceAnalog Synchronous Applications • Page 16-1Chapter 16Analog Synchronous ApplicationsThis chapter applies to sit

U.S. Robotics I-modem Command ReferenceAnalog Synchronous Applications • Page 16-2RequirementsYou must have these before you start:A Device with a Syn

U.S. Robotics I-modem Command ReferenceAnalog Synchronous Applications • Page 16-3Transmit and Receive synchronous timing pins are required at the EIA

U.S. Robotics I-modem Command ReferenceAnalog Synchronous Applications • Page 16-4Dial Using V.25bis SoftwareTo make synchronous connections using V.2

U.S. Robotics I-modem Command ReferenceUsing the AT Command Set • Page 1-10Getting a List of S-registersTo display a list of S-registers, issue the fo

U.S. Robotics I-modem Command ReferenceAnalog Synchronous Applications • Page 16-5&M7 Dial using the High Level Data Link Control (HDLC) protocol.

U.S. Robotics I-modem Command ReferenceAnalog Synchronous Applications • Page 16-63. Choose a connection rate to be used (between the I-modem and the

U.S. Robotics I-modem Command ReferenceAnalog Synchronous Applications • Page 16-7Example: AT&N10%N10&W <Enter> selects a connection rat

U.S. Robotics I-modem Command ReferenceAnalog Synchronous Applications • Page 16-8Note Due to the nature of synchronous dial-up, the I-modem auto-answ

U.S. Robotics I-modem Command ReferenceAnalog Synchronous Applications • Page 16-9commands are no longer necessary and are ignored. For dialing instru

U.S. Robotics I-modem Command ReferenceAnalog Synchronous Applications • Page 16-10CommandsDial OptionsCIC Connect incoming call Instructs the I-modem

U.S. Robotics I-modem Command ReferenceAnalog Synchronous Applications • Page 16-11Result CodesThese are the normal (X0) result codes.> (Greater Th

U.S. Robotics I-modem Command ReferenceAnalog Synchronous Applications • Page 16-12These are the extended result codes (X1) that replace CFI and INV.L

U.S. Robotics I-modem Command ReferenceAnalog Synchronous Applications • Page 16-13Commands and Result Codes NOT SupportedSynchronous Dialing Using AT

U.S. Robotics I-modem Command ReferenceAnalog Synchronous Applications • Page 16-14Note Data Terminal Ready (DTR) override must be OFF when using the

U.S. Robotics I -modem Command Reference page ii The material contained in this manual is for information purposes only and is subject to change wit

U.S. Robotics I-modem Command ReferenceModes of Operation • Page 2-1Chapter 2Modes of OperationCommand and Online ModesCommand mode. When the I-modem

U.S. Robotics I-modem Command ReferenceAnalog Synchronous Applications • Page 16-15Example: AT&N0 <Enter>Notes ¥ If an I-modem is set to a Þ

U.S. Robotics I-modem Command ReferenceAnalog Synchronous Applications • Page 16-16Note Due to the nature of synchronous dialup, the I-modem auto-answ

U.S. Robotics I-modem Command ReferenceAnalog Synchronous Applications • Page 16-17There are two methods of autodialing a stored telephone number: You

U.S. Robotics I-modem Command ReferenceUpgrading the I-modem’s Software • Page 17-1Chapter 17Upgrading the I-modemÕs SoftwareU.S. Robotics periodicall

U.S. Robotics I-modem Command ReferenceUpgrading the I-modem’s Software • Page 17-2Eprom 768kRam 256kSupervisor da

U.S. Robotics I-modem Command ReferenceUpgrading the I-modem’s Software • Page 17-3¥ Over the Internet, ftp to ftp.usr.com. Log in as anonymous and th

U.S. Robotics I-modem Command ReferenceUpgrading the I-modem’s Software • Page 17-43. Type t <Enter> to start an integrity test of the XMD Þle.

U.S. Robotics I-modem Command ReferenceUpgrading the I-modem’s Software • Page 17-5Once you see the OK response to the Calculating CRC and Resetting m

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-1Appendix AAlphabetic Command SummaryThis appendix contains an

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-23Wait 1 second before typing any data.When you type +++, the I

U.S. Robotics I-modem Command ReferenceModes of Operation • Page 2-2Depending on how bit 0 of S-register 14 is set, the I-modem will either revert to

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-3A Force an I-modem to answer when it is not receiving an incom

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-4Notes With the exception of the Dial options, I-modems ignore

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-5R Reverse frequencies. Use this command when calling an origin

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-6Fn Online local echo. If ON, an I-modem displays on your scree

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-7I5 Display settings stored in NVRAM.I6 Display statistics for

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-8O0 Return online (normal).O1 Return online and retrain. Use O1

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-9Note See the S-registers listing later in this appendix.Vn Dis

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-105/CONNECT 1200 ¥¥¥¥¥¥¥6/NO DIAL TONE ¥ ¥ ¥ ¥7/BUSY ¥¥¥¥¥8/NO

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-11Z Software reset. If DIP switch 1 is ON (factory setting), re

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-12Z! Hardware reset (equivalent to powering off and then back o

U.S. Robotics I-modem Command ReferenceModes of Operation • Page 2-3You can change the characters used to revert to Command mode or change the wait ti

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-13&Bn Set the serial port rate to variable or Þxed.Note The

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-14&D1 If issued before connecting with another device, the

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-15&F1 Load Hardware Flow Control template settings. &F2

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-16&H2 Use software ßow control. Requires that your software

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-17&I4 Hewlett Packard-Terminal mode. Applies only to I-mode

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-18&K3 Selective data compression. The I-modem negotiates on

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-19&M5 ARQ asynchronous mode. The I-modem hangs up if an ARQ

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-20&Rn Received data (RTS) hardware ßow control.&R0 Dela

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-21&Sn Send the computer a Data Set Ready (DSR) signal via t

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-22&T3 Start local digital loopback testing.&T4 Grant a

U.S. Robotics I-modem Command ReferenceModes of Operation • Page 2-4your screen. The Online-mode local echo setting determines whether the data that t

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-23&Y3 Nondestructive, unexpedited; the I-modem sends a brea

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-24&Zn=L stores the last-dialed number in position n.&Zn

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-25%C0 Defer conÞguration changes until the call is ended. Chang

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-26%E=4 Erase phone numbers in accounts 0*9.%E=5 Disable Account

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-27%Pn= Disable password security (n=0 or n=1) when no character

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-28%V=PWn Assign the password in account n in your I-modemÕs se

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-29*O=0 En-bloc dialing. Dials similarly to a cellular telephone

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-30*Tn=s Set the Terminal Endpoint ID (TEI). Your telephone comp

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-31*W=n Set the switch protocol used telephone companyÕs central

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-32S-registersTable AÐ1. S-registers: Their Functions and Defaul

U.S. Robotics I-modem Command ReferenceModes of Operation • Page 2-5F1 Online echo OFF. (Sometimes called full duplex.)Data and Fax ModesOnce you have

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-33S8 2 Sets the duration, in seconds, for the pause (,) option

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-343 8 On DTR signal, autodial the number stored in NVRAM at pos

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-35Bit Value Result0 1 Disable the I-modem's extra high-fre

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-367 128 Custom applications only.*The default 1.5K byte non-ARQ

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-37S21 10 Sets, in 10-millisecond units, the length of breaks se

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-382 4 Disable V.32 modulation; used for testing HST modu-lation

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-39S28 8 Sets the duration in tenths of a second of the extra 30

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-403 8 Enable V.23. Required for some British connections.6 64 D

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-41S51 0 Bit-mapped register. See Chapter 1, Using the AT Comman

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-42S54 64 Symbol rate bit-mapped register used primarily by U.S.

U.S. Robotics I-modem Command ReferenceModes of Operation • Page 2-6You can always switch the operating mode manually using one of these commands:AT+F

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-433 8 Disable 64S-4D mapping.S56 0 Bit-mapped register primaril

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-442 4 Fix the network rate at 64 Kbps (otherwise 56 Kbps).38AT&

U.S. Robotics I-modem Command ReferenceAppendix A: Alphabetic Command Summary • Page A-45a. See Appendix B, ASCII Chart.S69 0 Bit-mapped register. (Se

U.S. Robotics I-modem Command ReferenceAppendix B: ASCII Chart • Page B-1Appendix BASCII ChartDec Hex Char Dec Hex Char Dec Hex Char Dec Hex Char00 00

U.S. Robotics I-modem Command ReferenceAppendix B: ASCII Chart • Page B-215 0F SI 47 2F / 79 4F O 111 6F o16 10 DLE 48 30 0 80 50 P 112 70 p17 11 XON

U.S. Robotics I-modem Command ReferenceAppendix C: Fax Information for Programmers • Page C-1Appendix CFax Information for ProgrammersFax Service Clas

U.S. Robotics I-modem Command ReferenceAppendix C: Fax Information for Programmers • Page C-2FAX Service Class 2.0 CommandsIn addition to the standard

U.S. Robotics I-modem Command ReferenceAppendix C: Fax Information for Programmers • Page C-3that use software ßow control by default, U.S. Robotics f

U.S. Robotics I-modem Command ReferenceAppendix C: Fax Information for Programmers • Page C-4NotesIf you want to know more about the supported Class 1

U.S. Robotics I-modem Command ReferenceGlossary • Page G-1GlossaryNote Cross-references in the following deÞnitions are blue underlined.Symbols and Nu

U.S. Robotics I-modem Command ReferenceDialing, Answering, and Hanging Up • Page 3-1Chapter 3Dialing, Answering, and Hanging UpI-modems always make an

U.S. Robotics I-modem Command ReferenceGlossary • Page G-2AAdaptive Speed Leveling (ASL)Courier V.32bis and V.32terbo modems detect improved line cond

U.S. Robotics I-modem Command ReferenceGlossary • Page G-3Answer modeA state in which the modem transmits at the predeÞned high frequency of the commu

U.S. Robotics I-modem Command ReferenceGlossary • Page G-4asymmetrical modulationA transmission technique that splits the communi-cations channel into

U.S. Robotics I-modem Command ReferenceGlossary • Page G-5Auto Answer A feature in modems enabling them to answer incoming calls over the phone lines

U.S. Robotics I-modem Command ReferenceGlossary • Page G-6baud rateThe number of discrete signal events per second occurring on a communications chann

U.S. Robotics I-modem Command ReferenceGlossary • Page G-7bitSee binary digit.bit-mappingA technique that lets one decimal number (in this case, a num

U.S. Robotics I-modem Command ReferenceGlossary • Page G-8bufferA memory area used as temporary storage during input and output operations. An example

U.S. Robotics I-modem Command ReferenceGlossary • Page G-9Ccall-control signalingMessages carried over the telephone network that route, set up, and t

U.S. Robotics I-modem Command ReferenceGlossary • Page G-10Telecommunications Standards Sector (TSS). ITU-T replaces CCITT. For example, the Bell 212A

U.S. Robotics I-modem Command ReferenceGlossary • Page G-11Some protocols, such as USR HST and MNP, employ advanced techniques such as longer transmis

U.S. Robotics I-modem Command ReferenceDialing, Answering, and Hanging Up • Page 3-2Dial OptionsT Tone dial. This option is ignored because it is not

U.S. Robotics I-modem Command ReferenceGlossary • Page G-12COSee central ofÞce.Command modeWhen the I-modem is in Command mode, you can control it usi

U.S. Robotics I-modem Command ReferenceGlossary • Page G-13CSDSee circuit-switched data.CSVSee circuit-switched voice.CSV/DAlternating circuit-switche

U.S. Robotics I-modem Command ReferenceGlossary • Page G-14high-speed modems, the receiving modem accepts no more data until a defective block is rece

U.S. Robotics I-modem Command ReferenceGlossary • Page G-15data compression tableA table of values assigned for each character during a call under dat

U.S. Robotics I-modem Command ReferenceGlossary • Page G-16data terminal equipment (DTE)The device that generates or is the Þnal destination of data.D

U.S. Robotics I-modem Command ReferenceGlossary • Page G-17digital signalsDiscrete, uniform signals. In this manual, the term refers to the binary dig

U.S. Robotics I-modem Command ReferenceGlossary • Page G-18duplexIndicates a communications channel capable of carrying signals in both directions. Se

U.S. Robotics I-modem Command ReferenceGlossary • Page G-19equalizationA compensation circuit designed into modems to counteract certain distortions i

U.S. Robotics I-modem Command ReferenceGlossary • Page G-20faxSee facsimile.Fax modeThe mode in which the fax modem is capable of sending and receivin

U.S. Robotics I-modem Command ReferenceGlossary • Page G-21frameA data communications term for a block of data with header and trailer information att

U.S. Robotics I-modem Command ReferenceDialing, Answering, and Hanging Up • Page 3-3I-modem to detect at least one ring, wait for 5 seconds of silence

U.S. Robotics I-modem Command ReferenceGlossary • Page G-22handshakingA sequence that two modems undertake while connecting to agree on the parameters

U.S. Robotics I-modem Command ReferenceGlossary • Page G-23High-Speed Technology (HST)U.S. Robotics' proprietary signaling scheme, design, and er

U.S. Robotics I-modem Command ReferenceGlossary • Page G-24Industry Standard Architecture (ISA)The most common type of computer expansion bus. Other t

U.S. Robotics I-modem Command ReferenceGlossary • Page G-25ITU-TInternational Telecommunication Union-Telecommunication sector (formerly referred to a

U.S. Robotics I-modem Command ReferenceGlossary • Page G-26LLAPDSee Link Access Procedure for the D-channel.LAPMSee Link Access Procedure for Modems.L

U.S. Robotics I-modem Command ReferenceGlossary • Page G-27another system) the local echo is invoked through the ATE1 command. The command causes the

U.S. Robotics I-modem Command ReferenceGlossary • Page G-28modemA device that transmits/receives computer data through a communications channel such a

U.S. Robotics I-modem Command ReferenceGlossary • Page G-29NI-1See National ISDN-1.NI-2See National ISDN-2.NIUFSee North American ISDN UsersÕ Forum.no

U.S. Robotics I-modem Command ReferenceGlossary • Page G-30Northern Telecom DMS-100A make and model of central ofÞce switch. Before NI-1, AT&T and

U.S. Robotics I-modem Command ReferenceGlossary • Page G-31online fallbackA feature that allows high-speed error-control modems to monitor line qualit

U.S. Robotics I-modem Command ReferenceDialing, Answering, and Hanging Up • Page 3-4L Dial the last-dialed number. Start a command with ATDL instead o

U.S. Robotics I-modem Command ReferenceGlossary • Page G-32Pparallel transmissionThe transfer of data characters using parallel electrical paths for e

U.S. Robotics I-modem Command ReferenceGlossary • Page G-33Plug and Play ISAA variation of the standard ISA bus that attempts to automate the troubles

U.S. Robotics I-modem Command ReferenceGlossary • Page G-34protocolA system of rules and procedures governing communications between two or more devic

U.S. Robotics I-modem Command ReferenceGlossary • Page G-35rate adaptionAlso referred to as rate adaptation. V.120 and V.110 are rate adaption protoco

U.S. Robotics I-modem Command ReferenceGlossary • Page G-36remote echoA copy of the data received by the remote system, returned to the sending system

U.S. Robotics I-modem Command ReferenceGlossary • Page G-37SSDLCSee Synchronous Data Link Control.S/T-interfaceThe name given to the signaling interfa

U.S. Robotics I-modem Command ReferenceGlossary • Page G-38Service ProÞle IdentiÞer (SPID)A unique number, similar to an ordinary 10-digit telephone n

U.S. Robotics I-modem Command ReferenceGlossary • Page G-39shuntA small, plastic-and-metal piece used to cover sections of pins on a jumper. The shunt

U.S. Robotics I-modem Command ReferenceGlossary • Page G-40synchronous transmissionA form of transmission in which blocks of data are sent at strictly

U.S. Robotics I-modem Command ReferenceGlossary • Page G-41terminal adapterA device that connects another device that is not ISDN-ready to the ISDN S/

U.S. Robotics I -modem Command Reference page iii Table of Contents Chapter 1Using the AT Command Set 1-1 General Rules for Using AT Commands 1-1Bas

U.S. Robotics I-modem Command ReferenceDialing, Answering, and Hanging Up • Page 3-5Repeating a Command> Dial a number, wait 60 seconds for a conne

U.S. Robotics I-modem Command ReferenceGlossary • Page G-42throughputThe amount of actual user data transmitted per second with-out the overhead of pr

U.S. Robotics I-modem Command ReferenceGlossary • Page G-43Universal Asynchronous Receiver/Transmitter (UART)A computer chip that controls the signali

U.S. Robotics I-modem Command ReferenceGlossary • Page G-44V.21 FaxAn ITU-T standard for facsimile operations at 300 bps. U.S. Robotics or compatible

U.S. Robotics I-modem Command ReferenceGlossary • Page G-45V.23An ITU-T standard for modem communications at 1200 bps with a 75 bps back channel. Used

U.S. Robotics I-modem Command ReferenceGlossary • Page G-46V.29An ITU-T standard for facsimile operations that speciÞes modulation at 9600 bps, with f

U.S. Robotics I-modem Command ReferenceGlossary • Page G-47V.34An ITU-T standard that allows data rates as high as 33.6 Kbps.V.35An ITU-T standard tru

U.S. Robotics I-modem Command ReferenceGlossary • Page G-48V.120An asynchronous rate-adaption protocol for the B-channel. V.120 is a frame-oriented pr

U.S. Robotics I-modem Command ReferenceGlossary • Page G-49XXMODEMThe Þrst of a family of error-control software protocols used to transfer Þles betwe

U.S. Robotics I-modem Command ReferenceGlossary • Page G-50ZZMODEMAn error-correcting File Transfer Protocol that is related to, but faster than, XMOD

U.S. Robotics I-modem Command ReferenceDialing, Answering, and Hanging Up • Page 3-6Auto AnswerYou can set an I-modem to receive calls unattended. Loa

U.S. Robotics I-modem Command ReferenceDialing, Answering, and Hanging Up • Page 3-7Note If S0=0, Auto Answer will be disabled. Send ATI4 and be sure

U.S. Robotics I-modem Command ReferenceDialing, Answering, and Hanging Up • Page 3-8B0 ITU-T (formerly CCITT) answer sequence. Default. This is requir

U.S. Robotics I-modem Command ReferenceDialing, Answering, and Hanging Up • Page 3-9Call DetectionI-modems support Call Detection, which allows them t

U.S. Robotics I-modem Command ReferenceWorking with Memory • Page 4-1Chapter 4Working with MemoryI-modems contain three types of memory that you can i

U.S. Robotics I-modem Command ReferenceWorking with Memory • Page 4-2What is Stored Where?Current SettingsCurrent settings are saved in working memory

U.S. Robotics I-modem Command ReferenceWorking with Memory • Page 4-3Working with NVRAMIf you want the new setting to be a default, write it to NVRAM

U.S. Robotics I-modem Command ReferenceWorking with Memory • Page 4-4To dial the phone number you saved, type:ATDS2 <Enter>If the call requires

U.S. Robotics I-modem Command ReferenceWorking with Memory • Page 4-5Many of the DIP switches that were present on Courier V.34 modems are under softw

U.S. Robotics I -modem Command Reference page iv Chapter 4Working with Memory 4-1 Displaying Saved Information 4-6 Chapter 5Controlling Result Code

U.S. Robotics I-modem Command ReferenceWorking with Memory • Page 4-6Important Resetting the I-modem or powering it off and then on will not changethe

U.S. Robotics I-modem Command ReferenceWorking with Memory • Page 4-7Last-Dialed Number (DL?)At this command, the I-modem sends the number stored in t

U.S. Robotics I-modem Command ReferenceWorking with Memory • Page 4-8S12 Escape code guard time, 500 ms 50S13 Bit-mapped functions* 0S14 Bit-mapped fu

U.S. Robotics I-modem Command ReferenceWorking with Memory • Page 4-9* Bit-mapped registers have up to eight functions.S38 Disconnect wait time, sec 0

U.S. Robotics I-modem Command ReferenceWorking with Memory • Page 4-10 Working with Flash MemoryThe I-modem permanently stores three conÞguration Òtem

U.S. Robotics I-modem Command ReferenceWorking with Memory • Page 4-11For more information about hardware and software ßow control, see Chapter 10, Fl

U.S. Robotics I-modem Command ReferenceWorking with Memory • Page 4-12Transmit data hardware ßow control &H1 Hardware ßow controlRec'd data s

U.S. Robotics I-modem Command ReferenceWorking with Memory • Page 4-13* Detected by each I-modem from the AT preÞx of the &W com-mand that writes

U.S. Robotics I-modem Command ReferenceWorking with Memory • Page 4-14Result code subset X7 Extended. Includes all codes except VOICEProtocol response

U.S. Robotics I-modem Command ReferenceWorking with Memory • Page 4-15* Detected by each I-modem from the AT preÞx of the &W com-mand that writes

U.S. Robotics I -modem Command Reference page v Viewing and Changing the HostÕs ConÞguration 8-7 Chapter 9Dial Security 9-1 Setting Up Dial Security

U.S. Robotics I-modem Command ReferenceWorking with Memory • Page 4-16Speaker control M1 ON during dial through con-nectResult codes Q0 EnabledVerbal

U.S. Robotics I-modem Command ReferenceWorking with Memory • Page 4-17* Detected by each I-modem from the AT preÞx of the &W com-mand that writes

U.S. Robotics I-modem Command ReferenceWorking with Memory • Page 4-18Note DIP switch settings override AT commands at power-on. Make sure DIPSwitch 1

U.S. Robotics I-modem Command ReferenceWorking with Memory • Page 4-19&W To substitute a template other than &F1, write the desired template t

U.S. Robotics I-modem Command ReferenceControlling Result Code Displays • Page 5-1Chapter 5Controlling Result Code DisplaysThis section explains how t

U.S. Robotics I-modem Command ReferenceControlling Result Code Displays • Page 5-2Qn Enable/suppress the display of result codes. Q0 Display result c

U.S. Robotics I-modem Command ReferenceControlling Result Code Displays • Page 5-3Table 5-2. Result Codes Sets for Xn ValuesSettingResult Codes X0 X1

U.S. Robotics I-modem Command ReferenceControlling Result Code Displays • Page 5-421/CONNECT 12000 ¥ ¥¥¥¥¥¥25/CONNECT 14400 ¥ ¥¥¥¥¥¥43/CONNECT 16800

U.S. Robotics I-modem Command ReferenceControlling Result Code Displays • Page 5-5Table 5-3. Result Code MeaningsResult Code Meaning0/OK Command has b

U.S. Robotics I-modem Command ReferenceControlling Result Code Displays • Page 5-6Additional Result Code SubsetsNote ARQ (Automatic Repeat Request) is

U.S. Robotics I -modem Command Reference page vi Data Compression 11-14Getting Maximum Throughput 11-18 Chapter 12Querying 12-1Chapter 13Displaying

U.S. Robotics I-modem Command ReferenceControlling Result Code Displays • Page 5-7If the I-modem is set to X0 and the connection rate is 1200 bps-64 K

U.S. Robotics I-modem Command ReferenceControlling Result Code Displays • Page 5-8Note If your software cannot handle the added modulation information

U.S. Robotics I-modem Command ReferenceControlling Result Code Displays • Page 5-987/CONNECT 19200/V32 90/CONNECT 19200/ARQ/V3293/CONNECT 21600/V32 96

U.S. Robotics I-modem Command ReferenceControlling Result Code Displays • Page 5-10124/CONNECT 4800/V34 126/CONNECT 4800/ARQ/V34128/CONNECT 7200/V34 1

U.S. Robotics I-modem Command ReferenceControlling Result Code Displays • Page 5-11&A3 Default. Display error control (LAPM, HST, MNP, SYNC, V120,

U.S. Robotics I-modem Command ReferenceControlling EIA-232 Signaling • Page 6-1Chapter 6Controlling EIA-232 SignalingThe EIA-2321 interface deals with

U.S. Robotics I-modem Command ReferenceControlling EIA-232 Signaling • Page 6-2&Dn Tell the I-modem how to deal with the DTR signal.&D0 Operat

U.S. Robotics I-modem Command ReferenceControlling EIA-232 Signaling • Page 6-3Do not change the default setting of &S0 unless you know that your

U.S. Robotics I-modem Command ReferenceControlling EIA-232 Signaling • Page 6-4To change the DSR pulse time (in 20-second increments), set S-register

U.S. Robotics I-modem Command ReferenceControlling Data Rates • Page 7-1Chapter 7Controlling Data RatesYou can set the I-modem to use Þxed or variable

U.S. Robotics I -modem Command Reference page vii Chapter 15Troubleshooting 15-1 Problems That Occur Before Connecting 15-1Problems that Occur After

U.S. Robotics I-modem Command ReferenceControlling Data Rates • Page 7-2&Bn Set the serial port rate as variable or Þxed.&B0 Variable rates. A

U.S. Robotics I-modem Command ReferenceControlling Data Rates • Page 7-3To implement this feature, Þrst set your software to the desired rate. Then se

U.S. Robotics I-modem Command ReferenceControlling Data Rates • Page 7-4&N0 Variable rates. Negotiate for the highest possible rate.&N1-&N

U.S. Robotics I-modem Command ReferenceRemote Access • Page 8-1Chapter 8Remote AccessYou can set up the I-modem so other devices can view or change it

U.S. Robotics I-modem Command ReferenceRemote Access • Page 8-2Setting Up Remote AccessAt the Host I-modem1. Prepare to send AT commands.See Chapter 1

U.S. Robotics I-modem Command ReferenceRemote Access • Page 8-3Remote-access passwords can be up to eight alphanumeric characters long, and are not ca

U.S. Robotics I-modem Command ReferenceRemote Access • Page 8-4Erasing a Remote-Access PasswordTo erase a remote-access password, type:AT%P0= <Ente

U.S. Robotics I-modem Command ReferenceRemote Access • Page 8-51. Be sure that the host device has enabled remote access and is set to auto-answer (AT

U.S. Robotics I-modem Command ReferenceRemote Access • Page 8-6nection. When the host accepts the password, the following message and prompt will appe

U.S. Robotics I-modem Command ReferenceRemote Access • Page 8-7 Quitting a Remote-Access SessionIf you want to quit the remote-access login before you

U.S. Robotics I -modem Command Reference page viii Ampersand (&) Command Set A-12Percent (%) Command SetA-24Asterisk (*) Command SetA-28S-regist

U.S. Robotics I-modem Command ReferenceRemote Access • Page 8-8Note Be careful not to send ATZ or ATZ! or you will lose the connection!Remote ConÞgura

U.S. Robotics I-modem Command ReferenceRemote Access • Page 8-9 %Fn Change data format.%F0 No parity, 8 data bits.%F1 Mark parity, 7 data bits.%F2 Odd

U.S. Robotics I-modem Command ReferenceRemote Access • Page 8-10Note Even though, by default (%C0), the changes you make do not take effectuntil the n

U.S. Robotics I-modem Command ReferenceRemote Access • Page 8-11Quitting a Remote-Access Session If you want to quit the remote-access login before yo

U.S. Robotics I-modem Command ReferenceDial Security • Page 9-1Chapter 9Dial SecurityDial Security is designed to protect networks and data centers fr

U.S. Robotics I-modem Command ReferenceDial Security • Page 9-2¥ Autopass¥ Password PromptingSetting Up Dial SecurityHere is a summary of the steps fo

U.S. Robotics I-modem Command ReferenceDial Security • Page 9-31. Set up an account for yourself.Use any of the 10 available accounts (numbered 0Ð9) f

U.S. Robotics I-modem Command ReferenceDial Security • Page 9-4Dialback at a SpeciÞed NumberTo make the host I-modem hang up and then dial back a gues

U.S. Robotics I-modem Command ReferenceDial Security • Page 9-5Warning Do not insert spaces between commas or between Þelds and commas.Spaces will inv

U.S. Robotics I-modem Command ReferenceDial Security • Page 9-63. Set up guest-user accounts.Use the %An command to set up guest-user accounts in the

U.S. Robotics I -modem Command Reference page ix D G-14EG-18FG-19HG-21IG-23JG-25KG-25LG-26MG-27NG-28OG-30PG-32RG-34SG-37TG-40UG-42VG-43WG-48XG-49YG-

U.S. Robotics I-modem Command ReferenceDial Security • Page 9-7Modifying AccountsAfter you have set up an account, you can modify each Þeld independen

U.S. Robotics I-modem Command ReferenceDial Security • Page 9-8AutopassAutopass is the default form of password protection. Autopass automates the pro

U.S. Robotics I-modem Command ReferenceDial Security • Page 9-9¥ If the guest did not enable Dial Security, the host will not accept the call unless p

U.S. Robotics I-modem Command ReferenceDial Security • Page 9-10Note There is no Password Prompting capability in analog synchronous mode.Password Pro

U.S. Robotics I-modem Command ReferenceDial Security • Page 9-11Note You must use the &W command to save the settings in NVRAM. If youdonÕt, the n

U.S. Robotics I-modem Command ReferenceDial Security • Page 9-12OKFigure 9-1. The ATI10 Screen. Bold Characters Indicate the Commands Used to Control

U.S. Robotics I-modem Command ReferenceDial Security • Page 9-13Accessing Account Information (%S)Once Dial Security is enabled, you can access accoun

U.S. Robotics I-modem Command ReferenceDial Security • Page 9-14Erasing Account Information (%E)Use the %E=n command to make system edits.To edit or o

U.S. Robotics I-modem Command ReferenceDial Security • Page 9-15What the Guest User Needs to DoWhen guest users want to call in to the host (assuming

U.S. Robotics I-modem Command ReferenceDial Security • Page 9-16c. Check to see that you've set your Autopass password correctly by typing the fo