Figure 2-9 Open Collector Output; Figure 2-10 Rs-422/485 Communications Option Connections - Honeywell UDC2500 Product Manual

Installation
Load
Supply
Power
2
Load
Supply
Power
2
Open collector outputs are internally powered at +30 Vdc. Connecting an external
CAUTION
1
power supply will damage the controller.
2
Electromechanical relays are rated at 5 Amps @120 Vac or 30 Vdc and 2.5 Amps at 240 Vac.
Customer should size fuses accordingly. Use Fast Blo fuses only.
16 SHLD
17 D+ (B)
18 D– (A)
1 Do not run the communications lines in the same conduit as AC power.
2 Use shielded twisted pair cables (Belden 9271 Twinax or equivalent).

Figure 2-10 RS-422/485 Communications Option Connections

Time Simplex
Relay Load
To terminal
4 or 6
Relay Load
To terminal
7 or 9

Figure 2-9 Open Collector Output

1
SHLD
D+
D–
TO OTHER
COMMUNICATION
CONTROLLERS
D–
120 OHMS ON LAST LEG
UDC2500 Universal Digital Limit ControllerProduct Manual
19
+
20
L1
Output #1
21
L2/N
–
1
22
4
N.C. Alarm
Relay#2
23
5
N.O.
6 24
25
7
N.C. Alarm
Relay#1
8 26
N.O.
9
27
COMMUNICATION MASTER
D+ (B) SHLD
2
Connect shield
to ground at one
end only.
D+
Customer Supplied
Electromechanical relay
+
–
Customer Supplied
Solid-State relay
D– (A)
120 OHMS
xxxx
+
–
xxxx
24