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Chapter 10 − Modem Mode AT Commands, S-Registers, and Result Codes
Multi-Tech Systems, Inc. MultiConnect Serial-to-Serial Adapter User Guide (S000354A) 102
Command:
+EB Break Handling in Error Control Operation (Not available in V.22bis)
Values: n/a
Description: This extended-format compound parameter controls the break handling in V.42 operation. It
accepts three numeric subparameters:
<break selection> Decimal number 0 specifying that break is to be ignored; i.e., not
signaled to remote DCE.
<timed> Decimal number 0 specifying that any transmitted V.42 L-SIGNAL will
not indicate break signal length
<default_length> Decimal number 0 specifying that break is not delivered to the DTE.
Reporting Current or Selected Values
Command: +EB?
Reporting Supported Range of Parameter Values
Command: +EB=?
Command:
+EFCS 32-bit Frame Check Sequence (Not available in V.22bis)
Values: n/a
Description: This extended-format numeric parameter controls the use of the 16-bit or 32-bit frame check
sequence (FCS) option in V.42.
Reporting Current or Selected Values
Command: +EFCS?
Reporting Supported Range of Parameter Values
Command: +EFCS=?
Command:
+ER Error Control Report (Not available in V.22bis)
Values: 0, 1
Default: 0
Description: This extended-format numeric parameter controls whether or not the extended-format +ER:
intermediate result code is transmitted from the modem to the DTE.
S95 bit 3 is reset to 0 for +ER=0 and is set to a 1 for +ER=1. The more recent setting of +ER
or S95 bit 3, and the W command setting, determines the actual error control result code
reporting (see S95 Parameter and W Command).
+ER0 = Error control reporting disabled (no +ER intermediate result code transmitted).
+ER1 = Error control reporting enabled (+ER intermediate result code transmitted).
Reporting Current or Selected Values
Command: +ER?
Reporting Supported Range of Parameter Values
Command: +ER=?
+ER <type>
The +ER <type> reported represents 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.