Quantech QCC2015CEE, Installation, Operation And Maintenance Manual, Page: 157 / 172

QUANTECH
157
SECTION 10 – MAINTENANCE
Form QCC2-NM1
Issue Date: 5/20/2021
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 description:
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 + 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 + 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 + 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 + BI #.
Refer to Table 33 for complete list of BACnet and Mod-
bus registers.
The latest data map information is listed
on the Quantech Equipment Integration
website.
Communications Data Map notes
(See Table 34 on page 158)
1. IPU II based units are configured for Native BAC -
net 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 through
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.