3. Loosen the screws of pins B, A and G on the left (RS485-1) of the of the 6-pin RS485
connector supplied with the SMI package.
Figure 30: RS485 connector
4. Insert the wire ends into the G, A and B pins shown above. You can use any color
wire for each of the A, B and G connections, as long as the same color wire is used
for all A pins, the same color for all B pins and the same color for all G pins.
5. Connect all B, A and G pins in all SMIs. The following figure shows this connection
schema:
Figure 31: Example of multiple SMI units in an RS485 bus connection
NOTE
Do not cross-connect B, A and G wires. Make sure you are using the same
RS485 port (1/2) in all devices.
6. Tighten the terminal block screws.
7. Push the RS485 terminal block firmly all the way into the communication board.
SMI-180 Installation Guide MAN-01-00157-1.1
53
Creating an RS485 Bus Connection