Honeywell UMC800 - Manual (Page 51)

Mounting and Wiring
Wiring Communication Links
Release F UMC800 Controller Installation and User Guide 43
4/01
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)
Belden #9182 (or equivalent) with 150 ohm termination resistors (4,000 ft. maximum)
_
100 - 24 0 V ~
50 / 6 0 Hz
100 VA MAX.
F 3,15 A T
250V
L1
L2 / N
POWER
LoBAT
FORCE
RUN
DI
S
P
L
A
Y
BAT
CO
NF
IG
UR
A
T
IO
N
OFFLINE
RUN
PROGRAM
COM
M
B
COM
M
A
R
e
p
la
c
e ba
tt
er
y
w
it h
Ta
di
ra
n T
L 5
1
0
1 /S
o
n
ly
.
U
s
e
o f
a n
ot
he
r
b a
tt
e ry
m
a
y
p
re
s e
n
t a
r
is
k of
f
ir
e
o
r
expl
osi
o
n
.
S
e
e u
s e
rs
gu
id
e
f
o r i
n
st
ru
c ti
o
n s
.
RS232/RS485
Converter*
Host
Computer
Controller with Optional
Communications Board
To other UMC800 Controllers*
*RS 485 communications
requires termination resistors
at each end.
Figure 27 RS 485 port wiring (2 wire)