User manual

Appendix A Hayes Commands
Man_805U Rev 1.9 Page 53
ATSn=xx Set value of S-Register n to xx
ATV Verbal/Numeric Response Codes
V0 Numeric response codes
V1•
Verbose response codes
ATX Extended Response Codes. Allows more detailed response codes, including
connection speed.
X0•
Basic response codes only
X1 X0 + Connection Baud rate codes (CONNECT 19200, CONNECT 38400)
X2 X1 + BUSY Message
X3 X2 + RINGING Message
ATZ Reset the module, and re-load the configuration stored in non-volatile memory.
AT&Bxx Character Type (Data bits, Stop bits, Parity). “xx” is formed by adding the
values below.
0•
1 Stop Bit
0•
No Parity
1 2 Stop Bits 4 Zero Parity (Parity bit always zero)
0 7 Data Bits 8 Odd Parity
2•
8 Data Bits 12 Even Parity
AT&C Data Carrier Detect (DCD) Control. DCD is always on in transparent mode.
&C0 DCD Always on.
&C1•
DCD High when connected. Low otherwise.
&C2 DCD Always on, Pulses low on Disconnect (0.1 sec)
AT&D Data Terminal Ready (DTR) Behavior. The host controls DTR. This command
controls how the module reacts to the state of DTR.
&D0•
Module ignores DTR, and acts as if it is asserted.
&D1 If the host lowers DTR, the module returns to command mode, but does not
disconnect.
&D2 If the host lowers DTR, the module disconnects and returns to command mode.
&D3 If the host lowers DTR, the module disconnects and goes to low power mode.
Raising DTR will cause the module to dial if the leased line settings are correct
(&L1).
AT&E CRC Error Checking
&E0•
Disable CRC Error Checking
&E1 Enable CRC Error Checking
AT&F Restore Factory Defaults. This function is also available from the external DIP
Switches.
AT&G Set module’s Group Address Range 0-255. Default 0.