Serial interfaces cables and converters scheme  > HP pinouts
Pin Name Dir Description
1 CD <-- Carrier Detect
2 RXD <-- Receive Data
3 TXD --> Transmit Data
4 GND --- System Ground
5 CTS <-- Clear to Send
6 DSR <-- Data Set Ready
7 RI <-- Ring Indicator
8 RTS --> Request to Send
9 DTR --> Data Terminal Ready
9 pin D-SUB female connector layout
9 pin D-SUB female connector
9 pin D-SUB male connector layout
9 pin D-SUB male connector
According to 1 reports in our database (0 positive and 1 negative) this pinout may be incorrect.

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Source(s) of this and additional information: HP 4S Scanner pinout at The Pin-Out directory, from Hardware Book
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