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Lexmark C720 Reference Guide

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Interfaces
8-47
Serial Cable Pin Assignments (RS-422)
The RS-422 serial cable appears as follows:
Pin assignments for this 25-pin connector are shown in Table 8-7. You can set the 
polarity of these signals from the printer operator panel or through MarkVision 
Professional. 
The following illustration shows how the pins are used:
Table 8-7:  Dedicated Serial Connector Pin Assignments (RS-422)
Pin
Signal
Direction
Description
1
GND
Logic Ground
15
RXD*
In
Receive Data
17
RXD
In
Receive Data
19
TXD*
Out
Send (transmit) Data
25
TXD
Out
Send (transmit) Data
25
13
1
14
25-Pin
(Male)
Printer
Side
Printer
Side
25-Pin
Connector
Customized
Connector
(Optional)
Computer
Side
* Positive Signal