HP EISA/PCI Multiplexer Family Cabling, Diagnostics and Troubleshooting Manual

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Port to Device Cabling
RJ-45 Port Module and Fan Out Cable
Figure 4-11 RS-232 Modular cable to modem pinouts
Figure 4-12 shows cabling examples for RS-422 connections between the
HP J2501A and common HP terminals. In all cases, the transmit pair of
wires and the receive pair of wires should be twisted pairs to minimize
crosstalk. Cable lengths of up to 1200 meters are supported for all data
rates.
Figure 4-12 RS-422 Modular Cable to HP239xA and HP700/xx Terminals