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SECTION 5: C
OMMUNICATIONS
47
5.9 The REP485 Repeater (P/N 10060156)
The REP485 is a repeater that boosts communica-
tion signals over lengthy runs of wire. Place a
repeater after every 31 devices or after 2000’ (609.6
m) (whichever is reached first) and at each branch of
a hybrid network.
See Page 36, Figure 19
. Each
repeater begins a new network segment. You can
wire a maximum of four repeaters in series. Refer to
the sample network configurations using repeaters
(Daisy and Hybrid configuration sample
on Page 17,
Figure 9 through Page 18, Figure 10
). If the MS/TP
communications wire length is above 4000' (1219 m),
a repeater must be used to extend the signal. The
repeater can also be used to install in different meth-
ods:
• To extend communications beyond the standard
4000' (1219 m) limitation.
See Page 30, Figure
16
.
• To add parallel branches of ROBERTS GOR-
DON ® CORAYVAC ® Modulating Heating Control
communications bus wiring.
See Page 32, Figure
17
.
• To add more than 31 controllers to the network
chain, the repeater counts as the last controller in
the segment and the first controller in the next
segment.
Note: The maximum number of ROBERTS GOR-
DON ® CORAYVAC ® Modulating Heating Controls
that can be installed without a repeater is 32.