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Contents:

Welcome to 56K Information Access

Product Features

Installation for All Operating Systems

Troubleshooting

Technical Reference >

Introduction to Syntax and Procedures

Data Command Set

Result Codes

Glossary

Regulatory Information

Limited Warranty

Error Control Commands

 

+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:

0

Initiate call with Direct Mode
1
 Initiate call with Normal Mode (also referred to as Buffered 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.)
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 or specifies V.80 Synchronous Access Mode.

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.
8
 Initiate V.80 Synchronous Access Mode when connection is completed, and Data State is entered (see +ESA and +ITF commands).
9
 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.
+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 answer. Disable Synchronous Access Mode originator and answerer.

Reporting Current or Selected Values

Command: +ES?
Response: +ES: <orig_rqst>,<orig_fbk>,<ans_fbk>
Example: +ES: 3,0,2 For the default setting.
+ES: 6,0,8 For V.80 Synchronous Access Mode originator and answerer.

Reporting Supported Range of Parameter Values

Command: +ES=?
Response: +ES: (<orig_rqst> range),( <orig_fbk>range), ( <ans_fbk>range)
Example: +ES: (0-4,6,7),(0-4),(0-6,8,9)

+ER - Error Control Reporting

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).

+ER=[<value>]

Syntax

+ER=[<value>]

Defined Values

<value> A decimal number corresonding to the selected error control option:

0

Error control reporting disabled (no +ER intermediate result code transmitted). (Default.)

1
 Error control reporting enabled (+ER intermediate result code transmitted).

Reporting Current or Selected Values

Command: +ER?
Response: +ER: <current value>
Example: +ER: 0 for the default setting

Reporting Supported Range of Parameter Values

Command: +ER=?
Response: +ER: (<value> range)
Example: +ER: (0,1)

+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. The format of this result code is:

The +ER intermediate result code, if enabled, is issued after the Modulation report (+MCR and +MRR) and before the Data Compression Report (+DR).

Syntax

+ER:<type>

Defined Values

<type> An alphanumeric code corresponding to the selected protocol.

NONE Error control is not in use.
LAPM V.42 LAPM protocol is in use.
ALT MNP is in use.
Example +ER: LAPM

\B - Transmit Break to Remote

In non-error correction mode, the modem will transmit a break signal to the remote modem with a length in multiples of 100 ms according to parameter specified. If a number in excess of 9 is entered, 9 is used. The command works in conjunction with the \K command.

In error correction mode, the modem will signal a break through the active error correction protocol, giving no indication of the length.

Syntax

\B<value>

Defined Values

<value> Decimal number corresponding to the selected option.
1-9 Break length in 100 ms units. (Default = 3.) (Non-error corrected mode only.)

Result Codes

OK

If connected in data modem mode.
NO CARRIER

If not connected or connected in fax modem mode.

Note: When the modem receives a break from the remote modem, break is passed to the DTE as follows: In non-error correction mode direct, the break length is passed; in non-error correction mode normal and in error correction mode, a 300 ms break is passed.

&Y - Select Break Options

Select break handling options depending on parameter entered:

&Y Parameter
Break Option
0
Destructive
1
Expedited Destructive
2
Expedited Non-Destructive
3
Reserved

-K - MNP Extended Services

Enables or disables conversion of a V.42 LAPM connection to an MNP 10 connection. The parameter value, if valid, is written to S40 bits 0 and 1.

Syntax

-K<value>

Defined Values

<value> Decimal number corresponding to the selected option.

0

Disables V.42 LAPM to MNP 10 conversion. (Default.)

1
 Enables V.42 LAPM to MNP 10 conversion.
2
 Enables V.42 LAPM to MNP 10 conversion; inhibits MNP Extended Services initiation during V.42 LAPM answer mode detection phase.

Result Codes

OK

0 or 2.
ERROR

Otherwise