MT5656ZDX Multi-Tech Systems, MT5656ZDX Datasheet - Page 21

• Manufacturer Part Number: MT5656ZDX
• Description: MODEM V.92 DATA/FAX
• Manufacturer: Multi-Tech Systems
• Series: MultiModem® ZDXr

Specifications of MT5656ZDX

• Data Format: V.92
• Interface: RS-232
• Voltage - Supply: 9V
• Mounting Type: Desktop
• Package / Case: 5.7" L x 4.3" W x 1.0" H (145mm x 109mm x 25mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 881-1020

Error Control Commands
Command:
Description:
Subparameters:
Report Commands:
Command: +EFCS 32-bit Frame Check Sequence
Description:
Values:
Command:
Description:
Values:
Default:
Report Commands:
Command:
Description:
Subparameters:
Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)
+EB
+ER
+ES
<max_codewords_tx> The decimal number from 256 to 2048 that specifies the
<max_codewords_rx> The decimal number from 256 to 2048 that specifies the
<max_string_tx> The decimal number from 32 to 255 (maximum string length).
Break Handling in Error Control Operation
This extended-format compound parameter controls the break handling in V.42 operation.
It accepts three numeric subparameters:
+EB=[<break_selection>[,<timed>[,<default_length>]]]
<break_seleIction> Decimal number 0 specifying that break is to be ignored; i.e., not
<timed>
<default_length>
+EB?
+EB=?
This extended-format numeric parameter controls the use of the 16-bit or 32-bit frame
check sequence (FCS) option in V.42.
<value>
+EFCS?
+EFCS=?
Error Control Reporting
This extended-format numeric parameter controls whether or not the 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).
0, 1
0 = Error control reporting disabled (no +ER intermediate result code transmitted).
1 = Error control reporting enabled (+ER intermediate result code transmitted).
0
+ER?
+ER=?
Error Control 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:
+ES=[<orig_rqst>[,<orig_fbk>[,<ans_fbk>]]]
<orig_rqst> Decimal number which specifies the initial requested mode of operation
Reports current or selected values.
Reports supported range of parameter values.
maximum number of code words which should be negotiated in the transmit
direction. Default = 2048
maximum number of code words which should be negotiated in the receive
direction. Default = 2048
Decimal number 0 specifying the use of the 16-bit FCS specified in V.42.
Reports current or selected values.
Reports supported range of parameter values.
when the modem is operating as the originator. The options are:
0
1
2
3
4
7
Initiate call with Direct Mode.
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.
Initiate V.42 with Detection Phase. Default
Initiate MNP.
Initiate Frame Tunneling Mode when connection is complete and Data
Mode is entered.
signaled to remote DCE.
Decimal number 0 specifying that any transmitted V.42 L-SIGNAL
will not indicate break signal length.
Decimal number 0 specifying that break is not delivered to the DTE.
Reports current or selected values.
Reports supported range of parameter values.
Chapter 2 – AT Commands
21