Chapter 1 – AT Commands, S-Registers, and Result Codes
Multi-Tech Systems, Inc. AT Commands for the MultiModem & SocketModem MT9234 Series (S000434H)
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+ES
Error Control Selection
Description:
Use this command to select the error correction mode. If the modem is operating in
V.80 mode (synchronous buffered mode), and
+ES=,,8,
the
+ES?
will always return
+ES: 6,,8
. The setting of this command overwrites the
\N
command, and the
+ES
command is overwritten by the setting on a
\N
command.
Syntax: AT+ES=<orig_rqst>,<orig_fbk>,<ans_fbk>
Values:
Values Combination
Mode
+ES=1,0,1 Buffered
mode
+ES=0,1,0 Direct
mode
+ES=4,4,6
MNP or disconnect mode
+ES=3,3,5
LAPM or disconnect mode
+ES=4,0,6
MNP or buffered mode
+ES=3,0,2
LAPM, MNP, or buffered mode (Default)
+ES=2,0,2
LAPM or buffered mode
+ES=3,2,4
LAPM, MNP, or disconnect mode
+ES=,,8
V.42 sync buffer mode (V.80 enabled)
+ES=6,,8
V.42 sync buffer mode (V.80 enabled)
Reports
:
+ES?
Reports current or selected options.
+ES=? Reports
supported
options.
Result Codes:
OK
ERROR
+ESA
Set Up Error Control Parameters
Description:
Sets the control parameters for the DCE in Synchronous Access Mode.
Syntax: AT+ESA=<trans_idle>,<frame_idle>,<crc_type>,<nrzi_en>
Values:
Values Combination
Meaning
+ESA=0,,,,0,0,,
Disables
CRC generation and checking.
+ESA=0,,,,1,0,,
Causes the DCE to generate a 16-bit CRC in the
transmit direction in framed sub-Mode and check the CRC in the receive direction.
<crc_type> Values: 0
Disable CRC generation and checking.
1
In framed submode, the 16-bit CRC specified in V.42 is generated by the DCE
in the transmit direction and checked by the DCE in the receive direction.
Result Codes:
OK
ERROR
+ETBM
Call Termination Buffer Management
Description:
Sets the behavior of the modem upon call termination. Only
+ETBM=0,0,0
is a valid
combination. This means that the modem will discard all the buffered data when the
call is terminated.
Syntax:
AT+ETBM=<pending_TD>,<pending_RD>,<timer>
AT+ETBM=0,0,0
Values:
<pending_TD>
0 specifies that disconnect will occur immediately and all buffered
transmit data will be discarded when the local DTE requests call
disconnection.
<pending_RD>
0 specifies that disconnect will occur immediately and all buffered
receive data will be discarded when the local DTE requests call
disconnection.
<timer>
0 specifies that the modem will not attempt to deliver the buffered
data before abandoning the attempt and discarding remaining
data.
Reports
:
+ETBM?
Reports current or selected options.
+ETBM=? Reports
supported
options.
Result Codes:
OK
ERROR
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