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3.2.5 Error Control Commands
This section describes parameters used to select and operate the modem in V.42 LAPM
or MNP error control mode, Normal (Buffered) Mode, or V.80 Synchronous Access
Mode.
3.2.5.1 +ES - Error Control and Synchronous Mode Selection
This extended-format command specifies the initial requested mode of operation when
the modem is operating as the originator, optionally specifies the acceptable fallback
mode of operation when the modem is operating as the originator, and optionally
specifies the acceptable fallback mode of operation when the modem is operating as the
answerer. It accepts three numeric subparameters:
Syntax
+ES=[<orig_rqst>[,<orig_fbk>[,<ans_fbk>]]]
Defined Values
<orig_rqst> Decimal number which specifies the initial requested mode of operation
when the modem is operating as the originator. The options are:
1 Initiate call with Normal Mode (also referred to as Buffered Mode or Direct Mode)
only.
2 Initiate V.42 without Detection Phase. If V.8 is in use, disable V.42 Detection
Phase.
3 Initiate V.42 with Detection Phase. (Default.)
4 Initiate MNP.
6 Initiate V.80 Synchronous Access Mode when connection is completed, and Data
State is entered. (See +ESA and +ITF commands.)
<orig_fbk> Decimal number which specifies the acceptable fallback mode of operation
when the modem is operating as the originator.
0 LAPM, MNP, or Normal Mode error control optional. (Default.)
2 LAPM or MNP error control required; disconnect if error control is not established.
3 LAPM error control required; disconnect if error control is not established.
4 MNP error control required; disconnect if error control is not established.
<ans_fbk> Decimal number which specifies the acceptable fallback mode of operation
when the modem is operating as the answerer or specifies V.80 Synchronous Access
Mode.
1 Error control disabled, use Normal Mode.
2 LAPM, MNP, or Normal Mode error control optional. (Default.)
4 LAPM or MNP error control required; disconnect if error control is not established.
5 LAPM error control required; disconnect if error control is not established.
6 MNP error control required; disconnect if error control is not established.
8 Initiate V.80 Synchronous Access Mode when connection is completed, and Data
State is entered (see +ESA and +ITF commands).
Examples
+ES=6 Enable V.80 Synchronous Access Mode originator
+ES=,,8 Enable V.80 Synchronous Access Mode answerer
+ES=6,,8 Enable V.80 Synchronous Access Mode originator and answerer
+ES=3 Enable V.42 with Detection Phase originator. Disable V.80 Synchronous Access
Mode originator.
+ES=,,2 Allow LAPM, MNP, or Normal Mode connection answerer. Disable V.80
Synchronous Access
Mode answerer.
+ES=3,,2 Enable V.42 with Detection Phase originator, allow LAPM, MNP, or Normal
Mode connection