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V.250 AT COMMANDS

AT Commands for EV-DO-EV3 Modems

Syntax

Command Command type

ATS25=[<time>] Set

ATS25? Read

Parameters and Values

<time> Expressed in hundredths of a second.

0-255 Default: 5.

Note: The delay is effective only if its value is greater than 5.

Error Control

Error Control Selection +ES

Set command sets the manner of operation of the modem’s V.42 protocol.

Read command reports the current V.42 error control setting value in the format:

+ES: <orig_req>,<orig_fallback>,<ans_fallback>

Test command returns all supported values of the <orig_req>, <orig_fallback>, <ans_fallback> parameters.

Syntax

Command Command type

AT+ES[=<orig_req>,<orig_fallback>,<ans_fallback>] Set

AT+ES? Read

AT+ES=? Test

Parameters and Values

<orig_reg> Specifies the initial request mode of operation when originating a call.

0 Direct mode.

1 Initiate call with buffer mode only.

2 Initiate V.42 without detection phase. If V.8 is in use, this is a request to disable

V.42 detection phase.

3 Initiate V.42 with detection phase. Default: 3.

4 Initiate alternative protocol.

<orig_fallback> Specifies the acceptable fallback mode of operation when originating a call.

0 Error control optional; if error control can not be established, use buffered mode

with flow control. Default: 0.

1 Error control optional; if error control can not be established, change data rate to

match line <carrier> rate and use direct mode.

2 Error control required; if error control cannot be established, disconnect.

3 Error control (LAPM) required; if LAPM cannot be established, disconnect.

4 Error control (alternate MNP) required; if MNP cannot be established, disconnect.

<ans_fallback> Specifies the acceptable fallback mode of operation when answering a call.

0 Direct mode.

1 Error control disabled, use buffer mode.

2 Error control optional; if error control cannot be established, use buffer mode with

flow control. Default: 2.

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