C.2.2 Make a service port connection
CAUTION!
If the transmitter is in a hazardous area, do not use a service port connection. Service port
connections require opening the wiring compartment, and opening the wiring compartment
while the transmitter is powered up could cause an explosion. To connect to the transmitter in
a hazardous environment, use a connection method that does not require removing the
transmitter housing cover.
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 the service port, terminals 7 (RS-485/
A) and 8 (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 257
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