Introduction
Linkage
The i-Vu Open Control System uses linkage to exchange data between the zone terminals and their air source to
form a coordinated HVAC system. The system's air source controller and zone controllers are linked so that their
data exchange can be managed by one zone controller configured as the VAV Master.
A VAV Master can have a maximum of 63 slave zone controllers reporting to it. An MS/TP network is limited to a
maximum of 60 controllers, but a VAV Master can have controllers from other networks as slaves.
A linked VAV system can be as simple as a single MS/TP network with a VAV Master and slaves, or it can be as
complex as multiple MS/TP networks with VAV sub-masters and slaves on other networks. See the following
examples.
EXAMPLE #1
: A simple network. The VAV Master exchanges data between the slave controllers and the AHU
controller. The linked controllers on an MS/TP network must be sequentially addressed, and the VAV Master must
have the highest address.
Address
1
2
3
4
5
6
7
8
VAV
Master
Slaves
Network #:
16116
AHU
EXAMPLE #2
: The above network plus slave controllers on other networks.
Address
1
2
3
4
5
3
11
6
7
8
VAV
Master
Slaves
Network #:
16116
Network #:
16119
Network #:
16130
AHU
EXAMPLE #3
: The above network plus sub-masters and their slaves. (For VAV systems only. VVT systems do not
support sub-masters.) The sub-masters exchange data between their slaves and the VAV Master, and the VAV
Master handles data exchange for the whole system.
4
VAV Zone Controllers
