Bacnet Set-Up And Operation - Zener MSC-3 Instruction Manual

BACnet Set-up and Operation

Setting up the MSC-3 for various applications with BACnet communications is similar to conventional
wired control using the terminal strip. The interactions between wired control and BACnet features are as
follows:
Local mode
Control of the run function (ie starting and stopping) is from the console. BACnet commands do not
influence the starting and stopping of the MSC-3 in local mode. The speed reference used for local
operation is determined by the reference source selected by parameter F02 LOCAL REF. See list of
speed references for available choices.
Remote mode
Control of the run function (ie starting and stopping) is either from the terminal strip or by BACnet
depending on the setting of G166 RUN SIGNALS. Available choices are FROM TERMINALS or
FROM NETWORK. Setting this parameter to FROM TERMINALS allows the terminal strip alone to
control the run function. Selecting FROM NETWORK allows BACnet alone to control the run function via
binary value objects "Run fwd" and "Run rev"
Reset
Reset commands from all sources (terminal strip, internal MSC-3 functions and BACnet) are honoured at
all times.
Network Speed Reference
If the speed reference for the MSC3 in any given mode is to be determined by the network system, the
reference to select is COMMS_REF.
Essential services operation (ESO)
ESO mode selection from all sources (wired terminal or BACnet binary object ESO) is honoured at all
times.
CAUTION
Loss of communications is a loss of ESO if an ESO terminal not set up.
Local / remote mode selection
Control of local/remote mode is always from the terminal strip. Operation of the MSC-3 may be
monitored via BACnet regardless of the local/ remote mode.
BACnet Quick Set-up Guide
5. Set up all the usual menu items according to the application needs.
6. Set the various BACnet related menu items BEFORE connecting the network. This will avoid
disrupting the BACnet network unnecessarily.
• G160 Protocol: Ensure BACnet MS/TP is selected
• G161 bits/sec: Select the baud rate to suit the BACnet system.
• G163 MAC/Dev ID: This value must be unique for every BACnet device on the BACnet MS/TP
network segment that the MSC-3 is connected to.
• G164 Dev Instance: This is the Device Instance Number of the BACnet interface. This is a number
between 0 and 4,194,302. The number of each BACnet interface must be unique across the entire
BACnet installation.
• G165 Max Masters: This is equal to, or greater than the highest master MAC ID number on
the BACnet MS/TP network segment that the MSC-3 is connected to. For best BACnet MS/TP
performance, this should be set as low as possible.
• G166 RUN SIGNALS: This parameter determines if run commands are taken from the MSC-3
terminals or from the BACnet interface.
IM00120 IM00120
MSC-3 Instruction Manual
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