Procedure
1. Attach the signal converter to the serial port or USB port on your PC.
2. To connect directly to the transmitter terminals:
a) Remove the transmitter end-cap to access the wiring compartment.
b) Connect the leads from the signal converter to the RS-485 terminals.
Tip
Usually, but not always, you should connect the black lead to the A terminal and the red lead to
the B terminal.
Figure C-1: Connection to RS-485 terminals
A
C
B
A. PC
B. RS-232 to RS-485 converter
C. Transmitter with end-cap removed
Note
This figure shows a serial port connection. USB connections are also supported.
3. To connect over the RS-485 network:
a) Attach the leads from the signal converter to any point on the network.
b) Add resistance as necessary.
c) Ensure that the PLC or DCS is not trying to communicate to this meter at this time.
Restriction
The meter does not support concurrent connections from ProLink III and a PLC or DCS. If another
host is already communicating with the meter, ProLink III will not be able to connect, but its
connection attempts will corrupt messages from the other host. To make a ProLink III
connection, disconnect the cable from the host.
Configuration and Use Manual
Using ProLink III with the transmitter
MMI-20020954
March 2021
Configuration and Use Manual
169