FORM 150.66-NM3
ISSUE DATE: 09/25/2020
161
JOHNSON CONTROLS
SECTION 10 - MAINTENANCE
10
BACnet and Modbus Communications
Chiller data that can be read and modified using spe
-
cific BACnet or Modbus Register Addresses; and the
data associated with the addresses, is outlined in the
following descriptions:
Analog Write Points
This data can be read and modified using a BACnet
or Modbus network connection. The Modbus Register
Address for these points is 1025 plus AV #.
Binary Write Points
This data can be read and modified using a BACnet
or Modbus network connection. The Modbus Register
Address for these points is 1537 plus BV #.
Analog Read Only Points
This data can be read using a BACnet or Modbus net-
work connection and can NOT be modified using this
connection. The Modbus Register Address for these
points is 513 plus AI #.
Binary Monitor Only Points
This data can be read using a BACnet or Modbus net-
work connection and can NOT be modified using this
connection. The Modbus Register Address for these
points is 1281 plus BI #.
Refer to
Table 36
for complete list of BACnet and Mod-
bus registers.
The latest data map information is
listed on the Johnson Controls Equip
-
ment Integration website.
Communications Data Map Notes
(See Table 36)
1. IPU II based units are configured for Native BACnet
MS/TP and Modbus RTU communications.
Microgateway or E-Link not required for these two
communication protocols.
2. BACnet Object Types: 0= Analog In, 1 =
Analog Out, 2= Analog Value, 3= Bina-
ry In, 4 = Binary Output, 5= Binary Value,
8= Device, 15 = Alarm Notification (0 -127 are
reserved ASHRAE Objects).
3. WC= Inches of water column; CFM = Cubic Feet
per Minute; FPM = Feet per Minute: PSI = Lbs
per square inch; Pa = Pascals; kPa = Kilopascals;
PPM = Part per Million; kJ/kg = Kilojoules per
Kilogram.
4. Water Cooled Scroll units use the same firmware as
Air Cooled Scroll units, ignoring Fan Control.
Summary of Contents for YCAL Series
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