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Chapter 5 – AT Commands, S-Registers, and Result Codes
Multi-Tech Systems, Inc. SocketModem MT5600SMI Developer’s Guide 55
Error Control Commands
Command: +ES Error Control and Synchronous Mode Selection
Description: 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. Accepts
three numeric subparameters.
Default: Varies by request
Defined Values: <orig_rqst>
Decimal number specifies the initial requested mode of operation when the
modem is operating as the originator. The options are:
+ES0 Initiate call with Direct Mode.
+ES1 Initiate call with Normal Mode (also referred to as Buffered Mode)
only.
+ES2 Initiate V.42 without Detection Phase. If V.8 is in use, disable V.42
Detection Phase.
+ES3 Initiate V.42 with Detection Phase. (Default.)
+ES4 Initiate MNP.
+ES6 Initiate V.80 Synchronous Access Mode when connection is
completed, and Data State is entered. (See +ESA and +ITF
commands.)
+ES7 Initiate Frame Tunneling Mode when connection is complete, and
Data Mode is entered.
<orig_fbk>
Decimal number specifies the acceptable fallback mode of operation when
the modem is operating as the originator.
+ES0 LAPM, MNP, or Normal Mode error control optional. (Default.)
+ES1 LAPM, MNP, or Direct Mode error control optional.
+ES2 LAPM or MNP error control required; disconnect if error control is
not established.
+ES3 LAPM error control required; disconnect if error control is not
established.
+ES4 MNP error control required; disconnect if error control is not
established.
<ans_fbk>
Decimal number specifies the acceptable fallback mode of operation when
the modem is operating as the answerer or specifies V.80 Synchronous
Access Mode.
+ES0 Direct Mode.
+ES1 Error control disabled, use Normal Mode.
+ES2 LAPM, MNP, or Normal Mode error control optional. (Default.)
+ES3 LAPM, MNP, or Direct Mode error control optional.
+ES4 LAPM or MNP error control required; disconnect if error control is
not established.
+ES5 LAPM error control required; disconnect if error control is not
established.
+ES6 MNP error control required; disconnect if error control is not
established.
+ES8 Initiate V.80 Synchronous Access Mode when connection is
completed and Data State is entered (see +ESA and +ITF).
+ES9 Initiate Frame Tunneling Mode when connection is complete, and
Data Mode is entered.
Examples: +ES=6 Enable V.80 Synchronous Access Mode originator.
+ES=6 Enable V.80 Synchronous Access Mode originator.
+ES=,,8 Enable V.80 Synchronous Access Mode answerer.