Auto-Zone Control Systems Auto-Zone CV & CV-EX Systems Installation & Operation (Version 01C) - Manual (Page 16)

Section 2
Auto-Zone CV & CV-EX
2-4 Installation and Wiring
Communications Loop
The Communications Loop for both the CV and CV-EX systems is two-wire shielded
RS-485. The loop is best connected in daisy-chain configuration, meaning the loop is
connected from one controller to another. It is not necessary to sequentially address the
CV Controllers in relation to their location on the loop. Cable must be Belden No. 82760
or equivalent.
Tip: Incorrect wiring of the communications loop is the most common mistake made
during installation. Before beginning installation, write down the wire color used
on each terminal connection and consistently maintain that color code. It is
recommended that a continuous wire run be made between devices. Anytime a
splice is made in the cable, you increase your chance of problems.
Caution: Make sure when you are inserting wires into the terminal blocks that
strands of wire do not stick out and touch the next terminal. This could
cause a short or erratic operation.
CV & CV-EX Communications Loops
The CV and CV-EX communications loops are different in one respect. The CV has only
one communication loop while the CV-EX has two. On the CV system, all of the CV
controllers are daisy-chained together and tied into the CommLink on one end of the
loop. Each controller is assigned a numbered address by setting the DIP switch on each
one. See Figure 2-3 for the CV system communication wiring diagram. This is the only
communications loop required on the CV system.
For the CV-EX system communications wiring, see Figure 2-4. As is shown in the
diagram, all of the CV Controllers are daisy-chained together just like the CV system.
This is referred to as the “Local Loop.” This local communications loop is then tied into
the MiniLink communication interface to the terminals marked Local Loop instead of the
CommLink. On the CV-EX system, all of the MiniLinks terminals marked “Network
Loop” are then daisy-chained to each other and on one end to the CommLink
communication terminals. Each MiniLink is then addressed with a different number by
setting its DIP switch in similar fashion to the CV controllers.