S142 - Online Character Format

Description
S142 determines the DTE-DCE character format the modem uses while in the online state and using V.14, V.42, V.42 bis, or ASB interface procedures. S142 does not affect the DTE-DCE character format when the modulation type is FSK and ASB is not in use.

Type
value

Value range
0-5; Default value: 0

Stored by &Wn
yes

Displayed by &V
yes

Values

Bit         Online state character format                      

0           8N1 (this also covers all 7x1 formats)             

1           8E1                                                

2           8O1                                                

3           8M1 (same as 8N2)                                  

4           8S1                                                

5           Format of last command.

The effect of S142 depends on the DTE interface protocol used, as described below.

V.14 - The modem sends and receives characters in the selected format. This preserves parity bits during transmission.

V.42 and V.42bis - The modem sends and receives octets as prescribed by V.42, and absorbs and generates parity bits of 11-bit characters locally. While this procedure does not transmit parity bits between DCEs, it does conform to V.42.

ASB - The modem buffers octets but sends selected parity to other DCE, using V.14 procedure. The modem receives the selected parity from other DCE and passes it on to local DTE. This procedure passes parity bits between the DCEs and allows detection of line errors as parity errors.

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