Lexmark Dot Matrix Technical Reference - Page 99
Using an IBM AT Personal Computer (RS-232C), Serial Communication Parameters (RS-232C)
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Using an IBM AT Personal Computer (RS-232C) If you are using an IBM AT or compatible computer, use a 9-pin to 25-pin EIA RS-232C cable. We recommend one of the following for a 9-pin to 25-pin cable: • IBM P/N 6450242 (254 mm or 10 in.) • IBM P/N 6450217 (3 m or 10 ft.) The following illustration shows the pin assignments for the 9-pin to 25-pin RS-232C serial cable. IBM 9-Pin to 25-Pin Adapters 6450242 (254 mm or 10 in.) 6450217 (30.4 m or 10 ft.) Lexmark Null Modem Serial Cable 1038693 (15.24 m or 50 ft.) DCD 1 RXD 2 TXD 3 DTR 4 GND 5 DSR 6 RTS 7 CTS 8 RI 9 9 (F) Shield 1 2 TXD 2 3 RXD 3 4 RTS 4 5 CTS 5 6 DSR 6 7 GND 7 8 DCD 8 20 DTR 20 22 25 (M) 25 (F) Shield F. GND 1 2 TXD 3 RXD 4 RTS 5 CTS 6 DSR 7 L. GND 20 DTR 25 (M) Serial Communication Parameters (RS-232C) The acceptable values for serial communications parameters follow. Voltage Level Range The maximum voltage level range for control lines or data lines is from ± 25 positive V dc to ± 25 negative V dc. 99 Section 6: Using the Printer Interface