Chapter 1 – AT Commands, S-Registers, and Result Codes
Multi-Tech Systems, Inc. AT Commands for the MultiModem & SocketModem MT9234 Series (S000434H)
23
Result Codes:
OK
if <v8o> = 1, 6 and <v8a> = 1, 5 and <v8cf> = 0 to FF and <v8b> = 0 to 2.
ERROR if <v8o>
≠
1, 6 or <v8a>
≠
1, 5 or <v8cf>
≠
0 to FF or <v8b>
≠
0 to 2.
OK
if <signal> = 0–10 and <sig en> = 0, 1 and <msg en> = 0, 1 and <supp delay> =
0,1.
ERROR if <signal>
≠
0 to 10 or <sig en>
≠
0, 1 or <msg en>
≠
0, 1 or <supp delay>
≠
0,1.
+A8T
Send V.8 bis Signal and/or Message
Description:
Use this command to send a V.8 bis signal or message from the local DCE. This
command is only supported when V.80 is enabled.
Syntax: AT+A8T=<signal>,<1st message>,<2nd message>,<sig en>,<msg en>,<supp delay>
<signal> Values:
0
None
1
Initiating
Mre.
2
Initiating
MRd.
3
Initiating CRe, low power
4
Initiating CRe, high power
5
Initiating
CRd
6
Initiating
Esi
7
Responding MRd, low power
8
Responding MRd, high power
9
Responding
CRd
10
Responding
Esr
<sig_en> Values:
0
Enable detection of initiation signals. Default.
1
Enable detection or responding signals
<msg_en> Values: 0
Disable detection of messages. Default.
1
Enable detection of V.8
bis
messages
<supp_delay> Values: 0
No delay inserted. Default.
1
Insert 1.5 second delay between transmitted V.8
bis
signal and the subsequent
V.8
bis
message
Reporting
:
+A8T?
Reports current or selected values.
+A8T=?
Reports supported parameter values.
Result Codes:
OK if <signal> = 0 to 10 and <sig en> = 0, 1 and <msg en> = 0, 1 and <supp delay>
= 0,1.
ERROR if <signal>
≠
0 to 10 or <sig en>
≠
0, 1 or <msg en>
≠
0, 1 or <supp delay>
≠
0,1.
+DCS
Select V.42bis or V.44 Data Compression
Description:
Use this command to configure the available compression algorithms. The <v42bis>
parameter enables or disables the V.42 bis and the <v44> parameter enables or
disables V.44. This command works in conjunction with the
%C
command and the
result of either the
%C
command or the
+DCS
command replaces the current data
compression configuration.
Syntax: AT+DCS=<v42bis>,<v44>
Values:
0,0
V.42bis and V.44 data compression are both disabled.
0,1
V.42bis is disabled; V.44 data compression is acceptable.
0,2
V.42bis is disabled; V.44 only when connected to a V.92 server.
1,0
V.42bis is acceptable; V.44 data compression is disabled.
1,1
V.42bis is acceptable; V.44 data compression is acceptable.
1,2
V.42bis is acceptable; V.44 only when connected to a V.92 server.
Reporting
:
+DCS?
Reports current or selected values.
+DCS=?
Reports allowed parameter values.
Result Codes:
OK if <v42bis> = 0, 1 and <v44> = 0 to 2.
ERROR if <v42bis>
≠
0, 1 or <v44>
≠
0 to 2.
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