•
RS-485 connections can be made only when the transmitter's RS-485 terminals are
in RS-485 mode. If they are not, you must switch them to RS-485 mode by power-
cycling the transmitter and waiting 15 seconds before connecting.
•
When you are using a HART connection, ProLink III will not allow you to open more
than one window at a time. This is done to manage network traffic and optimize
speed.
•
You cannot make concurrent Modbus connections if the connections use the same
terminals. You can make concurrent Modbus connections if the connections use
different terminals.
A.2.2
Connect with ProLink III to the service port
Prerequisites
•
ProLink III is 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.
Using ProLink III with the transmitter
Configuration and Use Manual
199
Summary of Contents for Micro Motion 2500
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