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• You cannot make concurrent connections if the connections use the same
terminals. You can make concurrent connections if the connections use different
terminals.
B.2.2 Make a service port connection
Prerequisites
• ProLink III installed and licensed on your PC
• One of the following:
- RS-232 to RS-485 signal converter
- USB to RS-485 signal converter
• An available serial port or USB port
• Adapters as required (for example, 9-pin to 25-pin)
Procedure
1. Attach the signal converter to the serial port or USB port on your PC.
2. Access the service port terminals:
a. Remove the transmitter end-cap to access the wiring compartment.
b. Loosen the screw on the Warning flap and open the power supply compartment.
3. Connect the leads from the signal converter to terminals 33 (RS-485/A) and 34
(RS-485/B).
Tip
Usually, but not always, the black lead is RS-485/A and the red lead is RS-485/B.
Connection to service portFigure B-1:
A
B
C
A. PC
B.
Signal converter
C. Transmitter
Note
This figure shows a serial port connection. USB connections are also supported.
Using ProLink III with the transmitter
Configuration and Use Manual 201