7ML19985MA01
SITRANS RD500 – OPERATING INSTRUCTIONS
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AppendixA:
Input Modules
Wiring Diagram to Connect to Milltronics BW500
Milltronics BW500
Port 2 setup parameters:
*(2) refers to the primary index (secondary index 0).
Temination
It is important to use a terminating resistor at the extreme ends of your RS-485 network.
A terminating resistor needs to be connected across the A and B conductors of the last
device at each end of the network.
If you are using Belden 9842 cable, the value for termination is 120R, 0.5 W resistor.
Parameter
Description
P770 (2)* = 3
Modbus RTU slave
P771 (2) = 1
address 1 to 247
P772 (2) = 9.6
baud rate selectable
P773 (2) = 0
no parity
P774 (2) = 8
8 data bits
P775 (2) = 1
1 stop bit
P778 (2) = 0
modem not attached
customer device
RD500
Bus termination resistors to be 120R.
Recommended cable is Belden 9842.