6
ED 15117
Basic Protocol Information
Setting Unit Controller Communications Parameters
There are 12 communication parameters involved in setting up the unit controller for proper
communication with the three communication module options (BACnet IP/Ethernet, BACnet MS/TP,
L
ON
W
ORKS
). These parameters are set differently depending on which communication module is
ordered and shipped with the unit. The table below lists the three possible sets of default parameter
settings. Not all the parameters apply to all the module options. All parameters, except for Receive
Heartbeat, are configurable via the unit controller display.
The boldface settings can only be
configured via the unit controller OITS (Operator Interface Touch Screen).
See Magnitude
Chiller Unit Controller Operation Manual, OM 1034, for details. The items in parenthesis indicate
whether the parameter is Read-Only (R) or Read/Write (W) from the BACnet network.
Communication Parameter Settings
Parameter Name
BACnet IP
BACnet MS/TP
BACnet Ethernet
L
ON
W
ORKS
IP Address
172.15.5.8
2
N/A N/A N/A
IP Subnet Mask
255.255.255.0
N/A N/A N/A
Default Gateway
Address
“None”
N/A N/A N/A
UDP Port
47808
N/A N/A N/A
MSTP MAC Address
N/A
1
N/A N/A
MSTP Baud Rate
N/A
38400
N/A N/A
Device Instance Number
(W)
3000
3
3000
3
N/A N/A
Max APDU Length (R)
1024
480
1476
N/A
Device Object Name (W)
Magnitude
3
Magnitude
3
Magnitude
3
N/A
Max
Master
(W)
N/A 127 N/A N/A
Max Info Frames (W)
N/A
5
N/A
N/A
APDU Retries (W)
3
3
N/A
N/A
APDU Timeout (W)
3000
3000
N/A
N/A
Receive Heartbeat
1
N/A N/A N/A 0Sec
1.
All parameters, except for Receive Heartbeat, are configurable via the OITS panel.
2.
If the IP Address is set to 0.0.0.0 from the unit controller OITS panel or through the network,
DHCP addressing will be enabled and the IP address will be requested from the network DHCP
server.
3.
Device value must be unique on the BACnet network.
BACnet Networks
Compatibility
The Magnitude Chiller Unit Controller is tested according to the BACnet Testing Laboratory (BTL)
Test Plan.
It is designed to meet the requirements of the BACnet Standard (ANSI/ASHRAE 135-2004)
as stated in the Protocol Implementation and Conformance Statement (PICS). However, it is not BTL
listed. The PICS is located at the end of this manual or the separate PICS document, ED 15119
(available on www.mcquay.com.)
BACnet Objects
Magnitude Chiller Unit Controllers incorporate standard BACnet object types (i.e., object types defined
in the BACnet Standard) that conform to the BACnet Standard. Each object has properties that control
unit variables or data points. Some object types occur more than once in the Magnitude Chiller Unit
Controller; each occurrence or instance has different properties and controls different unit variables or
data points. Each instance is designated with a unique instance index. Some properties can be adjusted
