York YLPA 0115SE, Installation, Operation And Maintenance Manual

Page: 58 / 90

58
JOHNSON CONTROLS
FORM 150.68-ICOM1
ISSUE DATE: 10/15/2020
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 below:
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 #.
See Table 4 on page 59 for complete list of BACnet
and Modbus registers.
The latest data map information is listed
on the Johnson Controls Equipment In-
tegration website.
Communications Data Map Notes
For information on Data Maps see Table 4 on page
59.
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 = Binary In
4 = Binary Output 5 = Binary Value
8 = Device
15 = Alarm Notifica-
tion (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 Mil-
lion
kJ/kg = Kilojoules per
Kilogram.
4. Water Cooled Scroll units use the same firmware
as Air Cooled Scroll units, ignoring Fan Control.