Installation
17
© 2017 DynaGen Technologies Inc
TOUGH Series Manual
2.6.5
Modbus Wiring
The following table outlines some items that must be taken into consideration when connecting up a Modbus system.
Consideration
Description
Bus Termination
Each end of the bus must be terminated from A to B with /- 10 Ohm resistors. The
resistor must be able to handle at least 400mW of power dissipation.
Cable Selection
Shielded twisted pair 120Ohm impedance cable is required for communications. Shield drain
wire is NOT be used for the RS485 common. The cable must have one twisted pair for A and B
and a seperate wire or twisted pair for common.
An example is Belden 7895A, a two twisted pair, 20AWG, where the second pair can be used
for the RS485 common.
Distance (Power and Ground)
If running power and ground from the battery of your system to a remote device, use the
following guidelines for the gauge of the power and ground wires.
1.
Up to 450ft (137.2m) - 22AWG
2.
Up to 700ft (213.4m) - 20AWG
3.
Up to 1125ft (342.9m) - 18AWG
4.
Up to 1800ft (548.6m) - 16AWG
5.
Up to 2800ft (853.4m) - 14AWG
Termination at the Controller
The above cable must terminate no farther than 6 inches from the controller's RS485 (Modbus)
connector. Three inches is ideal.
Refer to the Example wiring diagram for a wiring example.
Содержание TG410
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