Biddle Modbus Manual page 8

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I
NSTALLATION
2.2 Connecting the gateway for BACnet (accessory)
2.3 Connecting the unit to Modbus
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The unit is designed for communication with a Modbus sys-
tem. With the aid of a gateway, this can be converted to com-
munication that is suitable for BACnet.
Warning:
w
Make sure that the mains supply is switched
off.
Warning:
w
Make sure that the power supply to the
BACnet system which is to be connected is
switched OFF.
1. Mount the gateway to the wall or on a DIN rail.
2. Connect the gateway to the BACnet IP (terminal 1), in
accordance with the wiring diagram.
3. Using the adapter, connect the gateway to a power socket
(connection 2), in accordance with the wiring diagram.
Note:
n
In the absence of a power adapter, you yourself must
fit a switch (250V, 6A) between the gateway and the
power supply.
4. Connect the unit to the gateway (terminal 3) as described
in 2.3.2 Connecting the unit to
2.3.1 Accessing the control circuit board
For SR: The connection for Modbus is on the top of the
unit.
For IndAC and NOZ : The connection for Modbus is
2 2
on the control circuit board in the unit.
• Open the unit as described in the unit's operating manual.
Warning:
w
Make sure that the mains supply is switched
off.
M / BAC
ODBUS NET
Modbus.