QUANTECH
146
FORM QTC3-NM1
ISSUE DATE 08/03/2022
SECTION 7 – UNIT CONTROLS
Communications Data Map Notes
(See Table 19)
1. IPU II based units are congured 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 rmware
as Air Cooled Scroll units, ignoring Fan Control.
The table below shows the real time error numbers that
may be encountered during communication setup and
a description of each.
TABLE 18 - 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.
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