McQuay AGS 230A' AGS 230B - BAS Interface; Connection to Chiller; Protocols Supported

OM AGSB-5 63
BAS Interface
Connection to Chiller
Connection to the chiller for all Building Automatic Systems (BAS) protocols will be at the
unit controller. An interface card, depending on the protocol being used, will have been
factory installed in the unit controller if so ordered, or it can be field installed.
Protocols Supported
Table 28, Standard Protocol Data
Protocol Physical Layer Data Rate Controller Other
BACnet®/IP
Ethernet 10 Base-T 10 Megabits/sec Color graphics SBC
Reference ED 15057:
BACnet PICS
BACnet MSTP RS485 (TBD)
pCO
2
Unit Controller
Reference ED 15057:
BACnet PICS
LonTalk®
FTT-10A 78kbits/sec
pCO
2
Unit Controller
LONMARK® Chiller
Functional Profile
ModbusRTU RS-485 (TBD)
pCO
2
Unit Controller
NOTE: For additional information on the protocol data available through the BACnet or
LonTalk communications modules, reference ED 15062, MicroTech II Chiller Unit
Controller Protocol Information.
Modbus - When selected, the ident number and baud can also be changed to suit the
application.
LONWORKS – When selected, the ident number and baud rate setpoints are not available.
Baud rate is locked at 4800.
BACnet – When selected, the ident number and baud rate setpoints are not available. Baud
rate is locked at 19200.
The factory-installed kits on the MicroTech II™ controller are as follows:
• BACnet Kit P/N 350147404: BACnet/IP, BACnet MS/TP, or BACnet Ethernet
• LONWORKS Kit P/N 350147401: LonTalk (FTT-10A)
• Modbus RTU
The following functions are available through the BAS where possible. Exact capabilities
may vary depending on the protocol in use.
• Enable/Disable chiller operation by setting the Unit Enable
setpoint.
• Select the operating mode by setting the Unit Mode
setpoint.
• Set the Cool LWT and Ice LWT setpoints.
• Set the Network Limit variable.
• Read all digital and analog I/O values.
• Read Enable status of chiller.
• Read current operating mode and status (state) of chiller.
• Send a description of each alarm when it occurs.
Reference McQuay documents ED 15057 and ED 15062 may be obtained from the local
McQuay sales office, from the local McQuayService office, or from the McQuay Technical
Response Center, located in Staunton, Virginia (540-248-0711).
The above are trademarks or registered trademarks of their respective companies: BACnet
from the American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.,
LonTalk, LONMARK and LONWORKS from Echelon Corporation, and Modbus and
ModbusRTU from Schneider Electric.