Lexmark CS730 Printer Languages and Interfaces Technical Reference - Page 139
Using the RS-232C serial interface, RS-232C serial cable pin assignments
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Printer interfaces 139 Using the RS‑232C serial interface RS-232C serial cable pin assignments 25-Pin 13 25 D-Shell (Male) 25-Pin D-Shell 13 25 (Female) 1 14 Printer Side 1 14 Computer Side Pin Signal Direction Description 1 GND N/A Frame Ground 2 TXD Out Transmit Data-Transmits data to your computer or terminal 3 RXD In Receive Data-Receives data from your computer or terminal 4 RTS Out Request to Send-Sets this signal high and the signal remains high while the printer is on 5 CTS In Clear to Send-Optionally used for serial data flow control protocol when in serial mode 6 DSR In Data Set Ready-Optionally used for data validation, depending on the Honor DSR setting, or flow control, depending on the serial protocol setting 7 GND N/A Logic Ground 20 DTR Out Data Terminal Ready-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 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 inches).