HP 24SII - Manual (Page 52)


When connecting an EIA-422 device to a computer port on the
M24SII-V07 I/O module using 4-wire Operation and unidirectional
Printer Sharing Mode, the cable required to connect the two devices
must have RX+ wired to TX+, and RX- wired to TX-, HSO+ wired to
HSI+, and HSO- wired to HSI-. Please see
Figure 11 below.
M24SII-V07 Computer Port Equipment
(EIA-422, 4-wire, unidirectional) Connections
RJ-11 RJ-11
1 HSO+ HSI+
2 HSO- HSI-
3 RX- TX-
4 RX+ TX+
Figure 11: M24SII-V07 EIA-422 (4-wire) Connection
If you are connecting a device other than another BayTech product,
you must refer to the operator's manual for your equipment to
determine which pins are defined as TX+, TX-, HSI+, and HSI-.
NOTE: If your EIA-422 device has only one input hardware
handshake line (i.e., no HSI+ and HSI-), connect this single
handshake line to HSO- on the M24SII-V07 module (Pin 5).
If you are connecting a computer port on the M24SII-V07 module to
another BayTech product (such as the Tran-x LPT-460 or PS-02)
using 4-wire Operation and unidirectional Printer Sharing Mode,
please refer to
Appendix A.7.4 for the recommended cable pinout.