MSC-3 Start Up
Communications
There are several communication interfaces for the MSC-3. As standard there is BACnet MS/TP and
MODBUS RTU both of which are EIA/RS-485 based.
EIA/RS-485 Communication Indicator
The communication indicator gives a visual signal of the operating condition of EIA/RS-485
communications. The indicator is found in the bottom right hand corner of the display. The indications
are:
OFF
Blank
25.0 Hz
50.0 FWD LOC
Indicates no EIA/RS-485 protocol
is selected and EIA/RS-485 port
is off.
No Communication
!
25.0 Hz
50.0 FWD LOC!
Indicates no communication for
the selected EIA/RS-485 protocol.
Communication
* (ashing)
25.0 Hz
50.0 FWD LOC*
Indicates he selected EIA/RS-485
protocol is communicating with
the network.
BACnet MS/TP
The MSC-3 BACnet interface implements the standard Application Specic Controller (B-ASC) as
described in ASHRAE Standard 135 2004.
BACnet Services Supported
• I-Am
• I-Have
• Read Property
• Write Property
Data Link Layer
The MSC-3 implements the BACnet MS/TP Data Link Layer as a master device. The communication port
is EIA/RS-485 compliant and is isolated from ground and other circuits.
MAC ID / Device Object Instance
Set via the front panel. Factory defaults are the same across all drives and must be changed off-line or
prior to connection to the network.
By default the MAC ID and Device Object Instance have the same value and can be set independently.
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