Chapter 5. Communications
196
PACSystems* RX7i, RX3i and RSTi-EP CPU Reference Manual
GFK-2222AD
5.2.5
Serial Cable Lengths and Shielding
The connection from a CPU serial port to the serial port on a computer or other serial device requires a
serial cable. Maximum cable lengths (the total distance from the CPU to the last device attached to the
serial cable) are:
Port
Maximum Cable
Length
Cable Type
COM1 (RS-232)
15 m (50 ft.)
Shielded cable
required
for RX3i;
Shielded cable optional for RX7i
COM2 (RS-485)
1200 m (4000 ft.)
Shielded cable
required
for all models that support this port
STA MGR/COM3
(RS-232)
15 m (50 ft.)
Shielded cable optional (RX7i only)
Note:
For details on conformance to radiated emissions standards, refer to Appendix A in the
following manuals:
PACSystems RX7i Installation Manual,
GFK-2223
PACSystems RX3i System Manual,
GFK-2314