Figure 27 Rs 485 Port Wiring (2 Wire) - Honeywell UMC800 Installation And User Manual

RS 485 serial communications
When connecting the controller to a RS 485 communication link (see Figure 27), you must use termination
resistors at each end of the link. The following cables with the listed resistor values can be used for
connecting the controller.
RS 485 Cables: Belden #9271 (or equivalent) with 120 ohm termination resistors (2,000 ft. maximum)
RS232/RS485
Converter*
*RS 485 communications
requires termination resistors
at each end.
Release F
4/01
Belden #9182 (or equivalent) with 150 ohm termination resistors (4,000 ft. maximum)
Host
Computer

Figure 27 RS 485 port wiring (2 wire)

UMC800 Controller Installation and User Guide
Controller with Optional
Communications Board
To other UMC800 Controllers*
Mounting and Wiring
Wiring Communication Links
OFFLINE
RUN
PROGRAM
POWER
LoBAT
FORCE
RUN
_
100 - 24 0 V ~
BAT
50 / 6 0 Hz
100 VA MAX.
F 3,15 A T
250V
L1
L2 / N
43