Multitech BL-Series User Manual download pdf (Page 23)

AT Commands for the MT5656ZDX, MT5600ZDX, MT5600BA/BL-Series Modems

Multi-Tech Systems, Inc. Commands Reference Guide (PN S000273D)

Command: +DS44 V.44 Compression Select

Description: This extended-format compound parameter controls V.44 data compression function.

Defined Values: <direction> Decimal number that specifies the desired direction(s) of operation of the data

compression function; from the DTE point of view.

0 Negotiated, no compression.

1 Transmit only.

2 Receive only.

3 Both directions, accept any direction. (Default.)

<compress_negotiation> Decimal number that specifies whether or not the modem

should continue to operate if the desired result is not obtained.

0 Do not disconnect if V.44 is not negotiated by the remote DCE as specified in

<direction>. (Default.)

1 Disconnect if V.44 is not negotiated by remote DCE as specified in <direction>.

<capability> Decimal number that specifies the use of stream method, packet method,

multi-packet method.

0 Stream method. (Default.)

1 Packet method.

2 Multi-packet method.

<max_codewords_tx> Decimal number from 256 to 2048 that specifies the maximum

number of codewords which should be negotiated in the transmit direction. (Default =

2048.)

<max_codewords_rx> Decimal number from 256 to 2048 that specifies the maximum

number of codewords which should be negotiated in the receive direction. (Default =

2048.)

<max_string_tx> Decimal number from 32 to 255 (maximum string length).

Command: +EB Break Handling in Error Control Operation

Description: This extended-format compound parameter controls the break handling in V.42 operation. It

accepts three numeric subparameters:

Syntax: +EB=[<break_selection>[,<timed>[,<default_length>]]]

Defined Values: <break_seleIction> Decimal number 0 specifying that break is to be ignored, i.e., not

signaled to remote DCE.

<timed> Decimal number 0 specifying that any transmitted V.42 L-SIGNAL will not indicate

break signal length <default_length> Decimal number 0 specifying that break is not

delivered to the DTE.

Reporting Current or Selected Values:

Command: +EB?

Response: +EB: <break_selection>,<timed>,<default_length><CR>

Example: +EB: 0,0,0 For default settings.

Reporting Supported Range of Parameter Values:

Command: +EB=?

Response: +EB: (<break_selection> range),(<timed> range), (default_length> range)

Example: +EB: (0),(0),(0)

Command: +EFCS 32-bit Frame Check Sequence

Description: This extended-format numeric parameter controls the use of the 16-bit or 32-bit frame

check sequence (FCS) option in V.42.

Defined Values: <value> Decimal number 0 specifying the use of the 16-bit FCS specified in V.42.

Reporting Current or Selected Values:

Command: +EFCS?

Response: +EFCS: <value>

Example: +EFCS: 0 For default setting.

Reporting Supported Range of Parameter Values :

Command: +EFCS=?

Response: +EFCS: (<value> range)

Example: +EFCS: (0)

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