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| AT | Attention - Needed before every other command (except A/ and the escape code). For Example: ATDT | |||||||||||||||||||||||||||
| A/ | Repeat the last command (Don't use ATA/) | |||||||||||||||||||||||||||
| A | Set to answer mode immediately, without waiting for ring | |||||||||||||||||||||||||||
| Bn | Set Bell mode (1200 bps protocol compatibility - V.22 or Bell 212A) Use n=0 CCITT V.22 with 2100Hz Answer Back Tone Use n=1 Bell 212A with 2225Hz Answer Back Tone |
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| Cn | Carrier state: n=0 OFF, n=1 ON | |||||||||||||||||||||||||||
| Dn | Use the following symbols in a dialing string:
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| DT | Get Dial Tone | |||||||||||||||||||||||||||
| En | Echo modem command (ON or OFF) n=0 echo OFF (NO) n=1 echo ON (YES) |
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| Fn | Full or Half Duplex operation n=0, Half Duplex n=1, Full Duplex |
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| Hn | Hook relay set to ON or OFF hook n=0 on hook (disconnect or hang up) n=1 off hook |
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| In | Request product code and ROM checksum / Return product ID/checksum n=0, Returns product ID - The modem sends its own 3-digit product code n=1, Performs checksum and returns it. Requests numeric checksum from firmware ROM n=2, Performs checksum and returns the result code. Request OK or ERROR state from the ROM checksum n=3, Returns ROM part number and revision level |
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| Ln | Loudness (volume of speaker) n=0, low n=1, low n=2, medium (prefered) n=3, high |
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| Mn | Mode of Speaker Control n=0, Speaker always OFF n=1, Speaker ON when phone is off-hook; OFF when Carrier Detected n=2, Speaker always ON n=3, Speaker ON after dialing until Carrier Detected. Speaker is turned OFF when carrier signal received |
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| On | On-line Mode Set n=0, Online. |
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| Qn | n=0, codes are sent n=1, codes are NOT sent |
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| Sn? | Reads the contents of status register Sn. Displays the value of S-register n. | |||||||||||||||||||||||||||
| Sn=x | S-register command - Used to modify an S register in the modem. It assigns a value x to the status register n. An &F or Z command resets the register to default values. | |||||||||||||||||||||||||||
| Vn | Sets result code format. Verbose mode for result codes. n=0, use digits (numeric) n=1, use words |
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| Xn | Xtended result code enabled and dialing mode set. n=0, Basic (300bps). Dial tone and busy signal not recognized (blind dialing). Result codes 0-4 enabled. n=1, extended(no dialtone or busy signals are detected). Result codes 0-5 and 100 enabled. n=2, extended(detects dialtone but not busy signals). Result codes 0-6 and 10 enabled. n=3, extended(no dialtone detect but detects busy signals). Result codes 0-5,7 and 10 enabled. n=4, extended(detects both dialtones and busy signals) |
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| Yn | Long Space Disconnect Option n=0, disabled n=1, enabled; disconnects after receiving 1.6 sec break. |
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| Z | Resets registers to default values with configuration profile from non-volatile memory. | |||||||||||||||||||||||||||
| &Cn | Data Carrier Detect(DCD) handling enabled. n=0, DCD always on. Modem keeps DCD (RS-232 pin 8) always on. n=1, DCD set by modem when remote carrier detected. DCD tracks data carrier detected by modem. |
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| &Dn | Data Terminal Ready(DTR) handling enabled. DTR ON/OFF time specified by S25. n=0, modem ignores DTR line (RS-232 pin 20) n=1, modem switches to asynch command mode when DTR goes off. n=2 does n=1,DTR off does n=1 plus disables auto answer, switches modem off hook, and returns to asynch command state. n=3, modem initializes when DTR goes off. |
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| &F | Resets S Registers and Commands to factory default setings from ROM config profile, as a powerup would do. | |||||||||||||||||||||||||||
| &Gn | Guard tone selected (only for CCITT modes, not used in US.) n=0, no guard tones n=1, 550 Hz guard tone n=2, 1800 Hz guard tone |
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| &Jn | selects telephone Jack n=0, RJ-11/RJ-41S/RJ-45S n=1, RJ-12/RJ-13 |
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| &Ln | selects line, dialin or leased n=0, dialin operation n=1, leased-line |
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| &Mn | Mode selected for asynchronous/synchronous communication n=0, asynchronous n=1, synchronous mode 1 -async dialing, then switch to synchronous operation n=2, synchronous mode 2 -stored number dialing n=3, synchronous mode 3 -manual dialing |
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| &Pn | selects make/break pulse length for Pulse dialing n=0, 39% make, 61% break(US and Canada standard) n=1, 33% make, 67% break |
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| &Qn | Communications Mode Option
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| &Rn | Request to Send/Clear to Send handling (sync mode only) n=0, CTS (RS-232 pin 5) tracks RTS (pin4) n=1, modem ignores RTS and turns CTS on when ready to receive synchronous data |
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| &Sn | Data Set Ready(DSR) handling. DSR ON indicates that the modem is connected to a communication channel and is ready. n=0, DSR always ON. Modem forces DSR ON whenever modem is turned on n=1, DSR (RS-232 pin 6) operates according to EIA specs. DSR turned ON at start of hand- shaking, off in test mode, idle state, or when carrier is lost |
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| &Tn | Test mode(not available in 300bps mode) n=0, terminate any test in progress after last command on a line, and return to command mode. n=1, initiates local analog loopback test n=3, initiates local digital loopback test n=4, sets modem to perform remote digital loopback when requested by another modem n=5, prohibits remote digital loopback n=6, initiates remote digital loopback with another modem n=7, initiates remote digital loopback with self-test n=8, initiates local analog loopback with self-test |
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| &V | Display active configuration profiles for S Register settings, commands, and telephone numbers. Inputs from DTE are ignored while this information is being sent. | |||||||||||||||||||||||||||
| &Wn | Write S registers and command config profile, last DTE speed, and parity to non-volatile RAM for poer up or hard reset. n=0, store active profile in location 0 n=1, store active profile in location 1 |
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| &Xn | Select the synchronous transmit clock source (sync mode only) n=0, Internal clock, modem generates timing and sends through pin 15 n=1, modem's host computer generates timing and sends it to modem on pin 24, which modem routes to pin 15. n=2, Receive clock, modem derives timing from incoming signal and supplies it to pin 15 |
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| &Yn | Select a stored profile to survive a power outage for power up (in addition to &Y) n=0, Select profile 0 on power up or hard reset n=1, Select profile 1 on power up or hard reset See, the &Wn command for particular commands and S Registers stored. The selected &Y command survives a power outage. |
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| &Zn | Stores telephone number. n=string of digits compatible with Dn |