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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) 
103
 
 
Command: 
+ES
 
Error Control 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.  It 
accepts three numeric subparameters: 
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: 
 
 
0  
Initiate call with Direct Mode. 
 
 
1  
Initiate call with Normal Mode (also referred to as Buffered Mode) only. 
 
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. 
 
7  
Initiate Frame Tunneling Mode when connection is complete and Data Mode 
is entered. 
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.) 
1  
LAPM, MNP, or Direct Mode error control optional. 
 
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. 
0  
Direct Mode. 
1  
Error control disabled, use Normal Mode. 
2  
LAPM, MNP, or Normal Mode error control optional. (Default.) 
3  
LAPM, MNP, or Direct Mode error control optional. 
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. 
Reporting Current or Selected Values: 
Command: +ES? 
Reporting Supported Range of Parameter Values: 
Command: +ES=? 
 
 
 
 
 
Command: 
+ESR Selective 
Reject
 
Values:  
 
n/a 
Description: 
   
This extended-format numeric parameter controls the use of the selective reject (SREJ) 
option in V.42. 
 
Reporting Current or Selected Values: 
Command: +ESR? 
Reporting Supported Range of Parameter Values: 
Command: +ESR=?