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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+EB
Break Handling in Error Control Operation
Description:
This extended-format compound parameter controls the break handling in V.42
operation. It accepts three numeric subparameters.
Syntax: AT+EB=<break_selection>,<default_length>
<break selection>
Values:
0
Ignore break. Default.
1 Nonexpedited,
nondestructive.
2 Expedited,
nondestructive.
3 Expedited,
destructive.
<default_length> Values:
10 ms to 90 ms Specify break length.
Reports:
+EB=? Reports supported options.
+EB? Reports current or selected options.
+EFCS
32-bit Frame Check Sequence
Description:
This extended-format numeric parameter controls the use of the 16-bit or 32-bit frame
check sequence (FCS) option in V.42.
Syntax: AT+EFCS=<value>
Value:
0
Sets the 32-bit frame check sequence to a 16-bit frame check sequence.
Reports: +EFCS?
Reports
current or selected options.
+EFCS=? Reports supported options.
+ER
Error Control Report
Description:
Use this command to enable or disable the error control report.
Syntax: AT+ER<value>
Values:
+ER0 Error control reporting disabled (no +ER intermediate result code
transmitted). Default.
+ER1 Error control reporting enabled (+ER intermediate result code transmitted).
Reports
:
+ER? Reports current or selected options.
+ER=? Reports supported options.
+ER <type> The +ER <type> reported is the current (negotiated or renegotiated)
modem-modem error control type. If enabled, the intermediate result code is
transmitted at the point during error control negotiation (handshaking) at
which the modem has determined which error control protocol will be used (if
any), before the final result code (e.g., CONNECT) is transmitted.
Specifically, the +ER intermediate result code is issued after the modulation
report (+MCR and +MRR) and before the data compression report (+DR).
Result Codes:
+ER: NONE
Data compression not in use.
+ER: LAPM
V.42 LAPM protocol is in use.
+ER: ALT
V.42 alternative protocol is in use.
OK
if <value> = 0, 1.
ERROR
if <value>
≠
0, 1.
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