Lexmark 33S0300 - Mono Chrome Laser Printer Reference page 336

Table 8-3: Dedicated Serial Connector Pin Assignments (RS-232C) (Continued)
Pin
7
20
Using an IBM-Compatible Personal Computer with Serial Interface RS-232C
Note:
If you are using any of the above products, or if your computer has a 9-pin D shell
connector that conforms to the IBM designed 9-pin serial port, use a 9-pin to 25-pin
cable, such as IBM Part Number 6450242 (254 mm or 10 in.).
Null modem cables, such as Lexmark part number 1038693 [15.24 m (50 ft)], will
connect the converter cable to the printer. The illustration below represents the 25-pin
connectors for the RS-232C cable (1038693).
Signal Direction Description
GND Logic Ground
DTR Out Data Terminal Ready. This pin is optionally used for serial
data flow control protocol when in serial mode.
These instructions are for connecting the printer to an IBM-compatible
personal computer using a dual asynchronous adapter or an external print
server.
13 25
1 14
8-22
Interfaces