Lexmark Optra C710 Technical Reference - Page 337
Using an IBM Personal Computer AT RS-232C, Computer
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8-34 Interfaces Using an IBM Personal Computer AT (RS-232C) Note: These instructions are for connecting the printer to an IBM Personal Computer AT, using the IBM PS/2 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 The following illustration shows the pin assignments for the 9-pin to 25-pin IBM EIA RS-232C serial cables. 9 to 25 Pin Cable Adapter, such as IBM 6450242 (10 in.) Lexmark 1038693 (50 ft) Shield Shield 9 (F) 25 (M) 25 (F) 25 (M)