34 OM AGSD-1
Building Automation System Interface
Connection to Chiller
Connection to the chiller for all BAS protocols is at the unit controller. An interface card
will have to be installed in the unit controller depending on the protocol being used.
Protocols Supported
The following building automation system (BAS) protocols are supported. It is possible to
change the building automation interface without loading different software.
BACnet
When protocol is set to BACnet, the baud rate and ident set points are not accessible. The
ident setting is locked at 1 for BACnet, and the baud rate is locked to 19200.
LONworks
With protocol set to LON, the baud rate and ident set points are not accessible. The ident
setting is locked at 1 for LON, and the baud rate is locked to 4800.
Modbus
With the protocol set to Modbus, the baud rate and ident set points are accessible.
Available Parameters
Types: A = Analog, I= Integer, D= Digital
I/O: I = Input only, O = Output only , I/O = Input/Output
Type Index I/O Description LONworks BACnet Modbus
A 1 I/O Network Cool LWT set point x x x
A 2 O Active LWT set point
x x x
A 3 I Network Capacity Limit x x x
A 4 O Evap EWT
x x x
A 6 O Evap LWT
x x x
A 10 O Unit capacity (%)
x x x
A 11 I Network Cool LWT set point default x
A 15 O Suction Temp
x x x
A 16 O Evap sat temp
x x x
A 17 O Evap pressure
x x x
A 19 O Discharge Temp
x x x
A 20 O Cond sat temp
x x x
A 21 O Cond pressure
x x x
A 31 O Slide Position
x x x
A 32 O Oil Pressure
x x x
A 39 O OAT
x x x
A 42 O Active Capacity Limit
x x x
A 50 I/O Network Ice LWT set point x x x
I 1 O Active alarms 1
x x x
I 2 O Active alarms 2
x x x
I 3 O Active alarms 3
x x x
I 4 O Active alarms 4
x x x
Continued on next page.
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