How to connect the rs-232c serial interface, Rs-232c serial cable pin assignments, Interfaces – Lexmark C762 User Manual
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Interfaces
8-19
How to Connect the RS-232C Serial Interface
Use Lexmark serial cable P/N 1038693 (15.24 m or 50 ft) to connect the serial
interface.
RS-232C Serial Cable Pin Assignments
The RS-232C serial cable appears as follows:
Table 8-3: Dedicated Serial Connector Pin Assignments (RS-232C)
Pin
Signal
Direction
Description
1
GND
Frame Ground
2
TXD
Out
Transmit Data. The pin transmits data to your computer or
terminal.
3
RXD
In
Receive Data. The pin receives data from your computer or
terminal.
4
RTS
Out
Request to Send. The printer sets this signal high and the
signal remains high while the printer is on.
5
CTS
In
Clear to Send. This pin is optionally used for serial data flow
control protocol when in serial mode.
6
DSR
In
Data Set Ready. This pin is optionally used for data
validation, depending on the Honor DSR setting, or flow
control, depending on the Serial Protocol setting.
7
GND
Logic Ground
20
DTR
Out
Data Terminal Ready. This pin is optionally used for serial
data flow control protocol when in serial mode.
25
13
14
1
25
13
14
1
25-Pin
D-Shell
(Female)
25-Pin
D-Shell
(Male)
Computer
Side
Printer
Side