HP 24SII - Manual (Page 45)

If you will be using 4-wire Operation, please use the reference chart
below to determine the applicable sections based on your application.
4-WIRE OPERATION OPTIONS
Application
Printer Sharing Mode Protocol
See Section:
Bidirectional Unidirectional EIA-232 EIA-422
1 X X 5.5.2.1
2 X X 5.5.2.2
3 X X 5.5.2.3
4 X X 5.5.2.4
&
NOTE: This configuration will support hardware or XON/XOFF
handshaking and bidirectional Printer Sharing Mode.
Ports on the M24SII-V07 I/O module using 8-wire Operation utilize the
following pins and signals for communication:
RJ-45 PIN-OUT INFORMATION
PIN SIGNAL
232/422 DIRECTION DESCRIPTION
1 DTR/HSO Output Handshake Out, enable/disable the receiving of
characters
2 GND/GND ---- Signal Ground
3 NC/TX+ Output No connection/Transmit Data (+)
4 TX/TX- Output Transmit Data/Transmit Data (-)
5 RX/RX- Input Receive Data/Receive Data (+)
6 GND/RX+ ----/Input Signal Ground/Receive Data (+)
7 GND/GND ---- Signal Ground
8 CTS/HSI Input Handshake In, enable/disable the transmitting of
characters