WattMaster WM-WCC3-TGD-01B - Manual (Page 505)

12. WCC III INSTALLATION
GUIDE
WCC III Technical Guide 12-9
The wire that makes up the communication loop should be
shielded. Shielded cable has an aluminum jacket over the wires
that could act as an “antenna” to carry away any “stray” electrical
signals that could interfere with the communication process. The
shield should be grounded throughout the SAT Loop.
The SAT RS-485 communication loop wires are connected to the
“R” and “T” and shield terminals on the satellite controllers using
¼-inch Sta-Con connectors. Make sure the polarity is correct.
That is to say, the wire connected to the “R” and “T” terminal on
the MCD must be connected to the “R” and “T” terminal on the
satellite controllers. If the “R” and “T” and shield wires are crossed,
the WCC III system will not communicate. The shield should be
connected together when the cable is cut in order to terminate the
wires at the satellite controller.
The communication loop wire from the WCC III - MCD is
connected to one of the “R” and one of the “T” terminals on the
satellite controller, which is physically located nearest the WCC
III - MCD. The other “R” and “T” terminals located on the satellite
controller can be used to extend the two-wire loop to the next
satellite controller, or the wires can branch off of a two-wire loop
running through the center of a building as shown in Figure 12-6.
NOTE: The shield wire must be connected at each and every
Satellite Controller also.
WCC III - MCD Typical System Architecture