APPENDIX C. ALPHABETICAL COMMAND SUMMARY Additional command summaries are on the bottom panel of the modem and in the Quick-Reference Card. REQUIREMENTS 1. Type commands in either upper or lower case, not a combination. 2. All commands except A/, A> and +++ are preceded by the AT prefix and are executed with the Enter/Carriage Return key (). 3. Command length = 40 characters maximum. The modem doesn't count the AT prefix, Carriage Return character, or spaces. It counts but doesn't act on punctuation such as hyphens and parentheses. 4. A missing numeric parameter is assumed to be zero, as in the command to hang up: ATH is the equivalent of ATH0 . BASIC COMMAND SET & See the Extended Command Summary that follows this Basic Set. % See the Percent Command Summary that follows the Extended Command Summary. A Force Answer mode when the modem hasn't received an incoming call. A/ Re-execute the last issued command one time. A/ doesn't take the AT prefix or a Carriage Return. A> Re-execute the last issued command continuously until canceled by pressing . Dial strings are re-executed ten times, after which execution terminates. A> doesn't take the AT prefix or a Carriage Return. Any key Terminate current dialing operation resulting from an issued Dial command; terminate Repeat mode (> or A>). AT Attention: lets the modem know commands are being issued to it. Must precede all other commands except A/, A> and +++. Bn Handshake options. B0 a) V.32 bis modulation (includes V.32 answer tones). Courier V.32 bis: Default. Courier HST Dual Standard: Required to answer V.32 bis calls. To call V.32 bis modems, may be set to B0 or B1. HST modulation remains enabled. Courier HST: See next paragraph. HST modulation remains enabled. b) CCITT V.25 answer sequence. Required for all Courier modems answering overseas calls at 1200 bps and above. B1 a) HST modulation (no V.32 bis answer tones). Courier HST: Default. Courier HST Dual Standard: Default. Also calls, but does not answer, V.32 bis modems. Courier V.32 bis: Calls, but does not answer, V.32 bis modems. b) Bell answer tone, United States and Canada. Cn Transmitter enabled/disabled. C0 Transmitter disabled; receive-only condition. C1 Transmitter enabled (Default). D Dial the number that follows and enter Originate mode. Optional parameters: P Pulse dial (Default). T Touch-Tone dial. , (Comma) Pause for 2 seconds. ; Return to Command mode after dialing. " Dial the letters that follow. ! Transfer call (flash switch-hook). W Wait for second dial tone (with X3 or higher). @ Wait for an answer (with X3 or higher). R Reverse frequencies. DL Dial the last-dialed number. DSn Dial the phone number stored in NVRAM at position n (n = 0-3). En Command mode local echo (display) of keyboard commands ON/OFF. DIP switch 4 is factory set to Command mode echo ON. E0 Local echo OFF. E1 Local echo ON. Fn Online local echo of transmitted data ON/OFF. Sometimes referred to as the Duplex setting. F0 Local echo ON. Sometimes called Half Duplex. Modem sends a copy to your screen of data it sends to the remote system. F1 Local echo OFF (Default). Sometimes called Full Duplex. Receiving system may send a remote echo of data it receives. Hn On/off hook control. H0 Hang up (go on hook). H1 Go off hook. In Inquiry. I0 Display product code. I1 Display results of ROM checksum. I2 Display results of RAM test. I3 Display call duration or real time (see Kn). I4 Display current modem settings. I5 Display nonvolatile random access memory (NVRAM) settings. I6 Display link diagnostics. I7 Display product configuration. Kn Modem clock operation: Call-duration or Real-time mode. K0 Return call duration at ATI3 (Default). K1 Return actual time at ATI3. Clock is set using ATI3=HH:MM:SS K1. Mn Monitor (speaker) control. M0 Speaker always OFF. M1 Speaker ON until carrier is established (Default). M2 Speaker always ON. M3 Speaker ON after last digit dialed and until carrier is established. O Return online after command execution. O0 Return online (normal). O1 Return online and retrain. Use if there were errors in a non-ARQ data transfer. O2 Return online, initiate a 2400 bps speed shift, and drop down to 1200 bps. Applies only to calls at 2400 bps, and may be used if the remote modem is a V.22 bis modem and ATO1 didn't work. Used mainly for testing purposes. P Pulse dial (Default). Qn Quiet mode: result codes displayed/suppressed. DIP switch 3 is factory set for result code display. Q0 Result codes displayed. Q1 Result codes suppressed (quiet). Q2 Result codes suppressed in Answer mode. Sr=n Set S-Register value: r is any S- Register; n must be a decimal number between 0 and 255. Sr.b = n Alternative command for setting bit- mapped registers: r is the bit-mapped register; .b is the bit; n is 0 (off) or 1 (on). Sr? Query contents of register r. T Tone dial. Vn Return result codes in words or numbers (Verbal/Numeric mode). DIP switch 2 is factory set for verbal result codes. V0 Numeric mode. V1 Verbal mode. Xn Result code set options. Use the following table (Default = X1, Extended set, codes 0-5, 10, 13, 18). Setting Result Codes X0 X1 X2 X3 X4 X5 X6 X7 0/OK + + + + + + + + 1/CONNECT + + + + + + + + 2/RING + + + + + + + + 3/NO CARRIER + + + + + + + + 4/ERROR + + + + + + + + 5/CONNECT 1200 + + + + + + + 6/NO DIAL TONE + + + + 7/BUSY + + + + + 8/NO ANSWER + + + + + 9/RESERVED 10/CONNECT 2400 + + + + + + + 11/RINGING + + + 12/VOICE + + 13/CONNECT 9600 + + + + + + + 18/CONNECT 4800 + + + + + + + 20/CONNECT 7200 + + + + + + + 21/CONNECT 12000 + + + + + + + 25/CONNECT 14400 + + + + + + + 43/CONNECT 16800 (HST) + + + + + + + Functions Adaptive Dialing + + + + + + Wait for 2nd Dial Tone (W) + + + + + Wait for Answer (@) + + + + + Fast Dial + + + + NOTE: Use &A0 or &A1 to disable/enable the following ARQ result codes. The default is &A1, ARQ codes (messages 14 to 19) enabled. 14/CONNECT/ARQ 22/CONNECT 12000/ARQ 15/CONNECT 1200/ARQ 24/CONNECT 7200/ARQ 16/CONNECT 2400/ARQ 26/CONNECT 14400/ARQ 17/CONNECT 9600/ARQ 47/CONNECT 16800/ARQ 19/CONNECT 4800/ARQ Use &A2 to add HST or V.32 modulation indicators, as well as ARQ and non-ARQ status, to the result codes. Use &A3 to add error control protocol indicators (LAPM, HST, MNP, SYNC, or NONE) and data compression type (V42BIS or MNP5) to the result codes. Z Software reset to NVRAM settings if DIP switch 10 is UP, to factory settings if DIP switch 10 is DOWN. Also initiates new settings of DIP switches 2-5, 7 and 9. +++ Escape code, preceded and followed by a guard time of at least one second of no data transmission. The modem responds to +++ by returning to Command mode and doing the following: DIP switch 9 UP (OFF, Factory setting): Hangs up and sends NO CARRIER result code DIP switch 9 DOWN (ON): Retains phone line connection and sends OK result code > Repeat the command continuously until canceled by pressing . If used in a Dial string, automated redialing terminates after ten attempts. / (Slash) Pause 125 milliseconds. $ Help Basic command summary request. &$ Help Extended command summary request. D$ Help Dial command summary request. S$ Help S-Register summary request. -S Stop/restart display of Help screens. -C Cancel display of Help screens. or -K AMPERSAND COMMAND SET &An Enable/disable additional result code subsets. See the X command in the previous section. &A0 ARQ result codes disabled. &A1 ARQ result codes enabled. Default. &A2 Additional HST or V32 modulation indicator. &A3 Additional error control indicator (LAPM, HST, MNP, SYNC, or NONE) and data compression type (V42BIS or MNP5). &Bn Data Rate, terminal-to-modem (DTE/DCE). &B0 DTE/DCE rate switches to follow connection rate (Default). &B1 DTE/DCE rate remains fixed at the DTE setting. Allowable rates are 38.4K, 19.2K, 9600, 4800, 2400, 1200, 300 bps. &B2 Shift to the user-defined fixed, higher DTE rate for ARQ calls, follow the connection rate for non- ARQ calls. Answer mode only. &Cn Carrier Detect (CD) signal, modem-to- DTE. DIP switch 6 is factory set so that the modem controls CD and the override is disabled. &C0 CD override (CD always ON). &C1 Modem sends CD signal when it connects with another modem, drops CD on disconnect. &Dn Data Terminal Ready (DTR) signal, DTE- to-modem. DIP switch 1 is factory set for normal DTR operations and the override is disabled. &D0 DTR override (DTR always ON). &D1 Reserved. &D2 Terminal must send DTR for modem to accept commands. Dropping DTR terminates a call. &F Load factory (ROM) settings into random access memory (RAM). &Gn Guard tone as part of answer sequence, for 2400/1200 bps calls from overseas. &G0 No guard tone, U.S., Canada (Default). &G1 550 Hz guard tone, some European countries. &G2 1800 Hz guard tone, U.K., some Commonwealth countries. Requires B0 setting. &Hn Transmit Data flow control. &H0 Flow control disabled (Default). &H1 Hardware (Clear to Send) flow control. &H2 Software (XON/XOFF) flow control. &H3 Hardware and software flow control. &In Received Data software flow control. &I0 Flow control disabled (Default). &I1 XON/XOFF to local modem and remote computer. &I2 XON/XOFF to local modem only. &I3 Host mode, Hewlett Packard protocol. &I4 Terminal mode, Hewlett Packard protocol. &I5 Same as &I2 in ARQ mode. In non-ARQ mode, XON/XOFF to remote modem for link flow control. &Kn Data compression. &K0 Disabled. &K1 Auto enable/disable (Default). Disabled if modem is set to &B0 and DTE rate switches to match link rate. &K2 Enabled regardless of &Bn setting. &K3 Selective data compressionêMNP Level 5 disabled. &Ln Normal/Leased phone line. &L0 Normal phone line (Default). &L1 Leased line; enables the modem to reconnect if disconnected. &Mn Error Control (ARQ) and Synchronous Operation. &M0 Normal asynchronous mode, error control disabled. &M1 Synchronous mode, error control disabled. &M2 Reserved. &M3 Reserved. &M4 Normal/ARQ asynchronous mode (Default). Normal connection if ARQ connection cannot be made. &M5 ARQ asynchronous mode. Modem hangs up if ARQ connection cannot be made. &Nn Link Rate (DCE/DCE) variable or fixed. With fixed link rate, modem hangs up if called or calling modem is operating at a different rate. &N0 Variable link operations (Default). Modem negotiates highest possible link rate with remote modem. &N1 300 bps. &N2 1200 bps. &N3 2400 bps. &N4 4800 bps. &N5 7200 bps. &N6 9600 bps. &N7 12K bps &N8 14.4K bps &Pn Pulse dialing make/break ratio. &P0 U.S./Canada make/break ratio (Default). &P1 U.K./some Commonwealth countries make/break ratio. &Rn Received Data hardware (RTS) flow control. &R0 Delay before modem responds to DTE's RTS signal with CTS signal. Delay is set in Register S26. &R1 Ignore RTS (Default). &R2 Received data sent to DTE only when RTS is high; used only if DTE supports RTS signaling. &Sn Data Set Ready (DSR) operations. &S0 DSR override, always ON (Default). &S1 Modem sends DTE a DSR signal when it senses a modem tone on the phone line. &S2 On loss of carrier, modem sends DTE a pulsed DSR signal with Clear to Send (CTS) following Carrier Detect (CD). &S3 This is the same as &S2, but without CTS following CD. &Tn Modem testing. &T0 End test. &T1 Initiate Analog Loopback (AL) testing. &T2 Reserved. &T3 Initiate Local Digital Loopback (LDL) testing. &T4 Grant Remote Digital Loopback (RDL). &T5 Prohibit RDL. &T6 Initiate RDL testing. &T7 Initiate RDL with self-test and error correction. &T8 Initiate AL with self-test and error correction. &W Write current settings to nonvolatile random access memory (NVRAM). &Xn Synchronous Timing Source. This specifies whether the modem or DTE generates the timing signals for the Transmit clock during a synchronous call. &X0 Modem's Transmit clock is the source (Default). &X1 DTE is the source. &X2 Modem's Receiver clock is the source; valid only in V.32 bis mode or for 2400/1200-bps connections in HST mode. &Yn Break handling. Destructive Breaks clear the buffer; expedited Breaks are sent immediately to the remote system. Under data compression, destructive Breaks cause both modems to reset their compression tables. &Y0 Destructive, don't send Break. &Y1 Destructive, expedited (Default). &Y2 Nondestructive, expedited. &Y3 Nondestructive, unexpedited; modem sends Break in sequence with data received from DTE. &Zn = s Write the following Dial string (s) to NVRAM at position n (n = 0-3). &Zn? Display the phone number stored in NVRAM at position n (n = 0-3). PERCENT COMMAND SET %Rn Rack Controller Unit (RCU) access. For use with USRobotics Total Control Modem Management Systems. %R0 Normal operations, RCU access disabled (Default). %R1 RCU access enabled. %T Touch-Tone Recognition mode enabled.