G166 Run Signals; G167 Terminator; G168 Comms Lost Time - Zener MSC-3 Instruction Manual

MSC-3 Start Up
Necessary for BACnet applications only, G165 Max Masters is a parameter for the BACnet MS/TP
connection logic. The value of G165 Max Master specifies the highest allowable MAC ID for master
devices. This value should be the same as that found in other MS/TP masters on the network segment.

G166 RUN SIGNALS

Available Choices:
• Press  once to begin.
• Use the ▲ / ▼ buttons to select the source of run command signals.
• Press  to confirm the choice.
This parameter determines explicitly where the FWD and REV command signals are sourced. Set G166
RUN SIGNALS to FROM TERMINALS when hardwired dedicated switches or push buttons are required
to start the MSC-3. Set G166 RUN SIGNALS to FROM NETWORK when commands sent through the
communication network are required to start the MSC-3.

G167 Terminator

Available Choices:
• Press  once to begin.
• Use the ▲ / ▼ buttons to enable or disable communication network termination.
• Press  to confirm the choice.
The MSC-3 has a "no-touch" communication cable termination capability. Set G167 Terminator to
ENABLED to make the line termination active. Set G167 Terminator to DISABLED to make the line
termination in-active.

G168 Comms Lost Time

Range: 1...600 secs
• Press  to edit the value.
• Press ▲/ ▼ to make changes to the value.
• Press  to accept the new value OR
• Press ESC to abandon the value change.
The MSC-3 will determine a loss of communications if no data exchange takes place for the interval
specified by G168 Comms Lost Time parameter.
For MODBUS, any data packet addressed to the MSC-3 and free of transmission errors will reset the
timer and the timing interval will begin again.
For BACnet, a token pass addressed to the MSC-3 and free of transmission errors will reset the timer
and the timing interval will begin again.
Setting G168 Comms Lost Time to zero disables the detection of communications loss. See also F09
COMMS PRESET on page 88.
112
G166 RUN SIGNALS
> FROM TERMINALS
FROM TERMINALS
FROM NETWORK
G167 Terminator
> DISABLED
ENABLED
DISABLED
G168 Comms Lost
Time: 10 secs
IM00120 IM00120