Lexmark 21Z0294 Technical Reference - Page 314
Using an IBM-Compatible Personal Computer with Serial Interface RS-232C, Table 8-3
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8-12 Interfaces Table 8-3: Dedicated Serial Connector Pin Assignments (RS-232C) (Continued) Pin Signal Direction Description 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. Using an IBM-Compatible Personal Computer with Serial Interface RS-232C Note: These instructions are for connecting the printer to an IBM-compatible personal computer using a dual asynchronous adapter or an external print server. 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). 13 25 1 14