5
ENGLISH
Installation
3
Installation
3.1
Installing the Module into the Terminal Cover
7mm
<_ 2.8 mm²
(12-22 AWG)
0.5 Nm/ 4.5 lb-in
1 2 3 4 5
3.2
RS-485 / Modbus RTU terminal block
Terminal
Description
Important
1
Earth ground / shield
For reliable communication make sure terminal
is connected to the Modbus network
GND/common. If only two wires are used (TXA
and TXB) in the network, connect Terminal 1 to
chassis/earth ground.
2
TXA
If controller is located at either end of the network,
a terminating resistor (120ohm typical) should be
connected across TXA and TXB
3
4
TXB
5
Protection against contact
• All terminals have basic isolation (single insulating distance)
• Protection against contact can only be ensured by additional measures (i.e. double insulation)
