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PROTOCOL
BACnet MS/TP (Master)
NOTE:
DS = Dip Switch
BACnet MS/TP SW3 example shown
Baud Rate Selections
BAUD RATE
9,600
19,200
38,400
76,800
MSB
SW1
Fig. 16 — VAV-RTU Open Address Switches Shield
Address
1
2
Slaves
Fig. 17 — Example — Simple Network
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 net-
works 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 net-
works. See the following example and Appendix B for configur-
ing linkage in VAV zone controllers.
EXAMPLE: 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.
SW3 Protocol Selection
DS8
DS7
Unused
OFF
DS2
OFF
ON
OFF
ON
Fig. 15 — VAV-RTU Open SW3 Dip Switch Settings
LSB
SW2
Network #:
16116
3
4
5
6
7
8
VAV
Master
RTU
DS6
DS5
OFF
OFF
UNUSED
DS1
(OFF)
OFF
OFF
(ON)
ON
ON
I-VU BUILDING AUTOMATION SYSTEM
i-Vu is a Carrier front-end and Building Automation System
(BAS). It is a web based network system that uses a native
BACnet over MS/TP communication protocol. The speed of the
network can range from 9600 to 76,800 baud. Refer to i-Vu litera-
ture for more information on i-Vu.
LOCAL ACCESS
Wall Mounted System Touch
The System Touch (SYT1-4-CAR) is a wall mounted interface
used to connect to the VAV-RTU Open or VAV Zone to access the
control information, read sensor values, and maintenance. This is
an accessory interface that does not come with the VAV-RTU
Open controller. You wire the System Touch to the VAV-RTU
Open or VAV Zone BACnet MS/TP network wiring connection.
There are 2 password protected levels in the display (User and
Admin). See the Equipment Touch Installation and Setup Guide
for more information. See Appendix A for navigation and screen
content.
Field Assistant
Field Assistant is a computer program included with the purchase
of the Tech Tool Kit (USB-TKIT). This is a field Tech Tool to set-
up, service, or download application software to the VAV-RTU
Open controller and includes a USB Link Cable. The link cable
connects a USB port to the J12 local access port. The Field Assis-
tant's menu structure is similar and functions the same as i-Vu. See
Fig. 19.
16
DS4
DS3
DS2
ON
OFF
Select Baud Select Baud
COMM
OPTION
SET TO
PORT
SET TO MSTP
(MASTER)
BAUD
PROTOCOL SELECTOR DIP SWITCHES
Shield
Fig. 18 — Network Wiring
DS1
38.4k
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