Roberts Gorden CORAYVAC, Installation Manual

Page: 101 / 119

SECTION 12: I
NTEGRATION WITH
B
UILDING
M
ANAGEMENT
S
YSTEM
(BMS)
97
5. Set the IP address on touch screen.
6. Set a unique Device Instance number. Equipment
Touch screen
The most common communication problems are the
result of not properly following the configuration
steps outlined in this manual. Review all the steps
and use the following list to check your settings.
Verify accuracy of the following:
• Proper connection wiring
• Confirm the correct BACnet network number
through the Equipment Touch
• BAS is sending requests to the proper BACnet
address of the controller
• Defined through the Touch screen display.
• To confirm settings, obtain a Modstat of the
device.
12.6 Modbus
The Modbus protocol is used mostly in the industrial
process market to communicate between PLCs (Pro-
grammable Logic Controllers).
Modbus is not a protocol that is particularly well
suited for building management because of its limited
master/slave structure. However, many companies
offer Modbus as an open protocol solution because it
is relatively easy to construct an interface.
12.6.1 To set up the Modulating Controller for
Modbus RTU or ASCII on Port 1
1. Turn off power to control board.
2. Using the rotary switches, set the controller's
address.
3. Set the Tens (10's) switch to the tens digit of the
address and set the Ones (1's) switch to the ones
digit.
4. Set the Selector DIP Switches 4 and 5 for the
appropriate communications speed (9600, 19.2k,
38.4k, or 76.8k bps).
The following example shows the DIP Switches set
for 38.4k, Port 1, and Modbus.