HP d640 HP D640 High-Volume Printer - User Manual (Printer and Accessories), C - Page 217
Interface, Configuration, B-2, RS-232 and RS-422 Host Interface Connectors pin diagram
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Using the Serial Interface The serial interface is accessible through a 25-pin female connector (Figure B-2) at the back of the printer. The interface can be configured to operate in an RS-232 or RS-422 configuration. Use the control panel to set the configuration. If you are set up for RS-232 operation, you can convert to RS-422 operation by shorting pin 14 of the interface to ground (pin 7). (RS-232 interface) (RS-422 interface) FGround 1 TxD 2 RxD 3 RTS 4 5 6 Ground 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 *422Sel DTR FGround 1 2 RxDA 3 4 5 6 Ground 7 8 TxDA 9 TxDB 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 *422Sel RxDB Figure B-2 RS-232 and RS-422 Host Interface Connectors pin diagram Interface Configuration Host Serial and Parallel Interface Configuration B-3