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5
Terminal Block
The ModbusLink modules have a 5 position terminal block that supports plug in screw terminals. The screw
terminals are connected to a 5-wire cable which is color coded.
Wire color
Description
White
Modbus over RS485-A
Green
Earth
Brown
Modbus over RS485-B
Red
8-16v dc power input
Black
Power Ground
Battery Connections
The ModbusLink-M/S has an internal battery to power the unit; however, external power (8-16v dc) can be
applied to J3. If external power is applied, the internal battery is automatically cut off and the module runs
off the external supply. The performance/functionality of the module is identical, regardless of the power
input source. If the external supply is removed, the unit automatically shifts to battery power. This transition
is transparent and does not interrupt the normal operation of the module.
