WattMaster WCC II - Manual (Page 213)

Section 5: Installation Guide
WCC II Operator’s Guide
Operator Interfaces 5-11
The communication loop wires are connected to the “R/T” and
“C” 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/T” terminal on the CPU must be connected to
the “R/T” terminal on the satellite controllers. If the “R/T” and
“ C” wires are crossed, the ECC/WCC II system will not work.
The shield should be connected together when the cable is cut to
terminate the wires at the satellite controller.
The wire which makes up the communication loop should be
shielded. Shielded cable has an aluminum jacket over the wires
which acts as an “antenna” to carry away any “stray” electrical
signals which can interfere with the communication process. The
shield should be grounded at one end only, preferably at the CPU
as shown below: