A - Answer Command

Command Line Format
AT [cmds] A <CR>

Suffix Values
none

Default
N/A

Stored by &Wn
N/A

Displayed by &V
N/A

Description
The A command instructs the modem to execute the Answer Process, then handshake with the remote modem. Refer to Answer Process and Handshaking Process. The A command is not valid in the Online Command State or if either &Q2 or &Q3 (Synchronous Mode) is in effect. The &An command forces the modem to answer in the originate mode.

Result Codes
CONNECT - if a connection is established. (Refer to Handshaking Process.

NO CARRIER - if a connection cannot be established or if aborted by a character from the DTE.
(Refer to the Answer Process and the Handshaking Process.)

ERROR - if in Online Command State or &Q2 or &Q3 is in effect when A is issued

OK - if aborted by DTR ON-to-OFF whenever certain combinations of &Dn and &Qn are in effect. (Refer to the &Dn command.)

Execution Time
See Answer and Handshake Processes.

DTE Interface Lines Affected
DSR, RLSD, HS (pin 12 and pin 23).

LEDs Affected
OH, CD, HS.

Aborting Events
"Key-press abort"aborts Answer and Handshaking Processes. DTR ON-to-OFF aborts Answer and Handshaking whenever certain combinations of &Dn and &Qn are in effect. (See the &Dn command.)

Cross Reference
Commands - &Qn

S-registers - S7 - Wait For Carrier

DTE signals - DTR, DSR, CTS, RLSD, High Speed (HS) - pins 12 and 23

Line signals - Carrier

LEDs - OH, CD, HS

Relays - Auxiliary, Line, Phone

Answering process

Handshaking process

Click here to return to the Contents page.