Multitech MT9234ZBAUSBCDC Betriebsanweisung PDF herunterladen (Seite 27)

Chapter 1 – AT Commands, S-Registers, and Result Codes

Multi-Tech Systems, Inc. AT Commands for the MultiModem & SocketModem MT9234 Series (S000434H) 27

+ES Error Control Selection

Description: Use this command to select the error correction mode. If the modem is operating in

V.80 mode (synchronous buffered mode), and +ES=,,8, the +ES? will always return

+ES: 6,,8. The setting of this command overwrites the \N command, and the +ES

command is overwritten by the setting on a \N command.

Syntax: AT+ES=<orig_rqst>,<orig_fbk>,<ans_fbk>

Values: Values Combination Mode

+ES=1,0,1 Buffered mode

+ES=0,1,0 Direct mode

+ES=4,4,6 MNP or disconnect mode

+ES=3,3,5 LAPM or disconnect mode

+ES=4,0,6 MNP or buffered mode

+ES=3,0,2 LAPM, MNP, or buffered mode (Default)

+ES=2,0,2 LAPM or buffered mode

+ES=3,2,4 LAPM, MNP, or disconnect mode

+ES=,,8 V.42 sync buffer mode (V.80 enabled)

+ES=6,,8 V.42 sync buffer mode (V.80 enabled)

Reports: +ES? Reports current or selected options.

+ES=? Reports supported options.

Result Codes: OK

ERROR

+ESA Set Up Error Control Parameters

Description: Sets the control parameters for the DCE in Synchronous Access Mode.

Syntax: AT+ESA=<trans_idle>,<frame_idle>,<crc_type>,<nrzi_en>

Values: Values Combination Meaning

+ESA=0,,,,0,0,, Disables CRC generation and checking.

+ESA=0,,,,1,0,, Causes the DCE to generate a 16-bit CRC in the

transmit direction in framed sub-Mode and check the CRC in the receive direction.

<crc_type> Values: 0 Disable CRC generation and checking.

1 In framed submode, the 16-bit CRC specified in V.42 is generated by the DCE

in the transmit direction and checked by the DCE in the receive direction.

Result Codes: OK

ERROR

+ETBM Call Termination Buffer Management

Description: Sets the behavior of the modem upon call termination. Only +ETBM=0,0,0 is a valid

combination. This means that the modem will discard all the buffered data when the

call is terminated.

Syntax: AT+ETBM=<pending_TD>,<pending_RD>,<timer>

AT+ETBM=0,0,0

Values: <pending_TD> 0 specifies that disconnect will occur immediately and all buffered

transmit data will be discarded when the local DTE requests call

disconnection.

<pending_RD> 0 specifies that disconnect will occur immediately and all buffered

receive data will be discarded when the local DTE requests call

disconnection.

<timer> 0 specifies that the modem will not attempt to deliver the buffered

data before abandoning the attempt and discarding remaining

data.

Reports: +ETBM? Reports current or selected options.

+ETBM=? Reports supported options.

Result Codes: OK

ERROR

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