Important!
Important!
•
•
The RS485 bus must not exceed 1Km end to end and must be terminated at
The RS485 bus must not exceed 1Km end to end and must be terminated at
each end.
each end.
•
•
Do not spur/star off the RS485 bus to create a 3rd leg.
Do not spur/star off the RS485 bus to create a 3rd leg.
•
•
Belden 8723 or shielded CAT5 / CAT5e / CAT 6 cable with stranded cores is
Belden 8723 or shielded CAT5 / CAT5e / CAT 6 cable with stranded cores is
recommended when wiring the RS485 bus.
recommended when wiring the RS485 bus.
•
•
RS485 cable MUST consist of twisted pairs.
RS485 cable MUST consist of twisted pairs.
Step 3: Set the RS485 Address
Each device on the RS485 network must be assigned with an individual address
unique to that network. The RS485 bus supports up to 16 devices, so the I/O
Expansion Board has a DIP switch where the address is set by switches 1 to 4 as
shown in the table below:
Address
Sw1
Sw2
Sw3
Sw4
1
On
Off
Off
Off
2
Off
On
Off
Off
3
On
On
Off
Off
4
Off
Off
On
Off
5
On
Off
On
Off
6
Off
On
On
Off
7
On
On
On
Off
8
Off
Off
Off
On
9
On
Off
Off
On
10
Off
On
Off
On
11
On
On
Off
On
12
Off
Off
On
On
13
On
Off
On
On
14
Off
On
On
On
15
On
On
On
On
Important!
•
On an i-Net based system, do not use address 0 for an I/O Expansion Board.
•
Always keep a record of the location and address for each device to avoid
duplication and confusion.
•
For further information on RS485 Bus Addressing, please refer to the i-Net
Installation Instructions.
3
Set the RS485 Address
