Appendix A | |
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“AT” Commands
Command |
| Function |
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&C0 | Force CD active regardless of the carrier state. | |
&C1 | Allow CD to follow the carrier state. | |
&D0 | Interpret DTR | |
| &Q0, &Q5, &Q6 The modem ignores DTR. | |
| &Q1, &Q4 | The modem hangs up. |
| &Q2, &Q3 | The modem hangs up. |
&D1 | Interpret DTR | |
| &Q0, &Q1, &Q4. | |
| &Q5, &Q6 | Asynchronous escape. |
| &Q2, &Q3 | The modem hangs up. |
&D2 | Interpret DTR | |
| &Q0 thru &Q6 The modem hangs up. | |
&D3 | Interpret DTR | |
| &Q0, &Q1, &Q4. | |
| &Q5, &Q6 | The modem performs soft reset. |
| &Q2, &Q3 | The modem hangs up. |
&F | Recall (restore) factory profile. | |
&G0 | Disable guard tone. | |
&G1 | Disable guard tone. | |
&G2 | Enable 1800 Hz guard tone. | |
&J0 | Set S register response only for compatibility. | |
&J1 | Set S register response only for compatibility. | |
&K0 | Disable DTE/DCE flow control. | |
&K3 | Enable RTS/CTS DTE/DCE flow control. | |
&K4 | Enable XON/XOFF DTE/DCE low control. | |
&L0 | Select dial up line operation. | |
&L1 | Select leased line operation. | |
&M0 | Select direct asynchronous mode. | |
&M1 | Select sync connect with async | |
| mode. |
|
&M2 | Select sync connect with async | |
| mode and enable DTR dialing of directory zero. | |
&M3 | Select sync connect with async off | |
| mode and enable DTR to act as Talk/Data switch. | |
&P0 | Set 10 pps pulse dial with 39%/61% makelbreak. | |
&P1 | Set 10 pps pulse dial with 33%/67% make/break. | |
&P2 | Set 20 pps pulse dial with 39%/61% make/break. | |
&P3 | Set 20 pps pulse dial with 33%/67% make/break. | |
&Q0 | Select direct asynchronous mode. | |
&Q1 | Select sync connect with async | |
| mode. |
|
&Q2 | Select sync connect with async | |
| mode and enable DTR dialing of directory zero. | |
&Q3 | Select sync connect with async | |
| mode and enable DTR to act as Talk/Data switch. | |
&Q4 | Select Hayes AutoSync mode. | |
&Q5 | Modem negotiates an error corrected link. | |
&Q6 | Select asynchronous operation in normal mode. | |
&R0 | CTS tracks FITS (async) or acts per V.25 (sync). | |
&RI | CTS is always active. | |
&S0 | DSR is always active. | |
&S1 | DSR acts per V.25. | |
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Command | Function |
|
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&T0 | Terminate any test in progress. |
&T1 | Initiate local analog loopback. |
&T2 | Returns ERROR result code. |
&T3 | Initiate local digital loopback. |
&T4 | Allow remote digital loopback. |
&T5 | Disallow remote digital loopback request. |
&T6 | Request an RDL without |
&T7 | Request an RDL with |
&T8 | Initiate local analog loop with |
&V | Display current configurations. |
&W0 | Store the active profile in NVRAM profile 0. |
&W1 | Store the active profile in NVRAM profile 1. |
&XO | Select internal timing for the transmit clock. |
&X1 | Select external timing for the transmit clock. |
&X2 | Select slave receive timing for the transmit clock. |
&Y0 | Recall stored profile 0 upon power up. |
&Y1 | Recall stored profile 1 upon power up. |
&Zn=x | Store dial string x (to 40) to location n (0 to 19). |
%D | Refer to Percent (AT%) Commands table. |
%E0 | Disable line quality monitor and auto retrain. |
%E1 | Enable line quality monitor and auto retrain. |
%L | Return received tine signal level. |
%Q | Report the line signal quality. |
%TTn | PTT certification test signals. |
#CID=0 | Disable Caller ID. |
#CID=1 | Enable Caller ID with formatted presentation. |
#CID=2 | Enable Caller ID with unformatted presentation. |
| ECC AT Commands |
%C0 | Enable data compression. |
%C1 | Enable MNP 5 data compression. |
%C2 | Enable V.42 bis data compression. |
%C3 | Enable both V.42 bis and MNP 5 compression. |
\A0 | Set maximum block size in MNP to 64. |
\A1 | Set maximum block size in MNP to 128. |
\A2 | Set maximum block size in MNP to 192. |
\A3 | Set maximum block size in MNP to 256. |
\Bn | Transmit Break to remote. |
\L0 | Use stream mode for MNP |
\L1 | Use block mode for MNP. |
| MNP 10 AT Commands. |
)M0 | Disable MNP 10 link negotiation power adjustment. |
)M1 | Enabie MNP 10 link negotiation power adjustment. |
*H0 | Select MNP 10 link negotiation at highest rate. |
*H1 | Select MNP 10 link negotiation at 1200 bps |
Disable MNP 10 extended services. | |
Enable MNP 10 extended services. | |
Enable MNP 10 extended services detection only. | |
Disable MNP 10 fallback to V22 bis/ V.22. | |
Enable MNP 10 fallback to V22 bis/V.22. | |
@M0 | Select initial transmit level. |
:E0 | Disable the compromise equalizer. |
:E1 | Enable the compromise equalizer. |
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