Johnson Controls
173
Section 7: Unit controls
Form 150.72-ICOM6
Issue date: 12/19/2023
7
Communications data map notes
1.
IPU II based units are configured for Native BAC
-
net MS/TP and Modbus RTU communications.
E-Link Gateway not required for these two com-
munication 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 = Lb 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.
The following table shows the real time error numbers
that may be encountered during communication setup
and a description of each.
Table 22:
Real Time Error Numbers
Error
number
(##)
Description
0
All ok
1
Datum type ok test failed
2
English text too long
3
Floating point exception
4
Get packet failed
5
Get type failed
6
Invalid unit conversion
7
Invalid hardware selection
8
Real time fault
9
Spanish text too long
10
Thread exited
11
Thread failed
12
Thread stalled
13
IO board reset
14
BRAM invalid
15
BACnet setup failed
Reboot required (cycle power) after set
-
tings are changed.