Rs-485 communications – WattMaster WM-WCC3-TGD-01B User Manual
Page 454
10. RS-485 COMMUNICATIONS
WCC III Technical Guide
10-2
SAT 3C/D/F TUC Loop Communications
The SAT 3C/D/F TUC Loop
Communications
The software that is in the “old” existing TUC Controllers that
were connected to the “old” SAT 2c/d Controllers does not need
to be changed. WattMaster Controls decided to use the same
communications protocol to ease the replacement of the SAT 2C/D
controllers. Do not connect this loop to the SAT III “network”
communications loop as communication-related problems will
result.
Figure 10-2: Profi le of SAT III and SAT 3C/D/F showing the SAT III and TUC RS-485 Communication Connections
PLEASE NOTE:
Normally, all of the RS-485 wiring is
wired “R” to “R,” “T” to “T,” and “SHLD” to “SHLD” or
“SH.” This method of connection works for the wiring from
TUC Controller to TUC Controller. But, on the SAT 3C/D/F
Controller, the wire from the TUC “R” connection must
be wired to the SAT 3C/D/F “T” connection, and the SAT
3C/D/F Controller “R” connection must be wired to the TUC
“T” connection.
REAR PROFILE VIEW WCC III - MCD (STANDARD WITH TWO SAT III COMMUNICATIONS CONNECTIONS)
REAR PROFILE VIEW WCC III - MCD (WITH OPTIONAL TWO MORE SAT III COMMUNICATIONS CONNECTIONS)
Figure 10-1: Rear Views of the WCC III – MCD showing SAT III RS-485 Communication Connections