Communications - Zener MSC-3 Instruction Manual

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
25.0 Hz
50.0 FWD LOC
No Communication
25.0 Hz
50.0 FWD LOC!
Communication
25.0 Hz
50.0 FWD LOC*
BACnet MS/TP
The MSC-3 BACnet interface implements the standard Application Specific 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.
62
Blank
Indicates no EIA/RS-485 protocol
is selected and EIA/RS-485 port
is off.
!
Indicates no communication for
the selected EIA/RS-485 protocol.
* (flashing)
Indicates he selected EIA/RS-485
protocol is communicating with
the network.
IM00120 IM00120