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ROBERTS GORDON
®
ULTRAVAC™ CONTROLLER INSTALLATION MANUAL
26
5.5.1 Repeater
If the RS-485 communications wire length is above 4000', a repeater must be used to extend the signal. The
repeater can also be used to create parallel branches of ROBERTS GORDON
®
ULTRAVAC™ controller
communications bus wiring. Each repeater is sold in a 12" x 12" NEMA 1 enclosure with a 120/24 Vac
transformer.
There is no limit on the quantities of repeaters used in a system.
FIGURE 19: Repeater Wiring
RS232
RS485
RS485 OUTREF
- +- +
PROGRAM
RUN
RS485 OUT
- + - +
RS485 OUT RS485 OUT
- + - +
RS485 OUT
1/4A
1/4A
1/4A 1/4A
Red
Black
Red
Black
Red
Black
Drain
Red
Black
RS232
RS485
RS485 OUTREF
- +- +
PROGRAM
RUN
RS485 OUT
- + - +
RS485 OUT RS485 OUT
- + - +
RS485 OUT
1/4A
1/4A
1/4A 1/4A
Red
Black
Red
Black
Red
Black
RS232
RS485
RS485 OUTREF
- +- +
PROGRAM
RUN
RS485 OUT
- + - +
RS485 OUT RS485 OUT
- + - +
RS485 OUT
1/4A
1/4A
1/4A 1/4A
Red
Black
Red
Black
Red
Black
120 Vac
Central ULTRAVAC™
Controller
Satellite 1
Satellite 2
Red
Black
Drain
Satellite 3
Satellite 4
Red
Black
Drain
Satellite 5
Satellite 6
120 Vac
24Vac
120 Vac
24Vac
120 Vac
24Vac
Description Part Number
Repeater 10080445