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CAT-5
WHEN CONNECTING MULTIPLE DISTRIBUTION PANELS,
CONNECT THE "REF" TERMINALS FOR EACH
THERMOSTAT TO THE "REF" TERMINAL OF THE
RESPECTIVE DISTRIBUTION PANEL AND CONNECT THE
REF TERMINALS OF EACH DISTRIBUTION PANEL TO
EACH OTHER.
RX TX
DATA
RS-232
RX TX
ENABLE
RS-485
RX TX
DATA
RS-485
POWER
Model 8811 Protocol Adapter
Power
7.5VAC RS-485 RS-485 RS-232
B+ B- REFA-
RCA+ A- B+ B-
A
B
A+
OFF ON
OFF ON
ON OFF
ON OFF
PWR
PWR
A
B
A
B
RCA+A-B+B-
B+ B- REFA-
RCA+ A- B+ B-
A
B
A+
OFF ON
OFF ON
ON OFF
ON OFF
PWR
PWR
A
B
A
B
RCA+A-B+B-
DISTRIBUTION PANEL #1 DISTRIBUTION PANEL #2
9
1. MAKE SURE THAT ALL SWITCHES IN THE DISTRIBUTION PANEL ARE OFF!
2. If more than one Distribution Panel is used in the thermostat network, the communication lines must be daisy-chained together.
• Use the wire colors shown in DIAGRAM 5 to help ensure proper, consistent connections.
DIAGRAM 5 – Multiple Distribution Panels
CONNECT MULTIPLE DISTRIBUTION PANELS
Step 7