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CAUTION!
If the transmitter is in a hazardous area, do not connect directly to the transmitter terminals.
Connecting directly to the transmitter terminals requires 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 opening the wiring compartment.
CAUTION!
If you connect directly to the mA terminals, the transmitter's mA output may be affected. If you
are using the mA output for flow control, set devices for manual control before connecting
directly to the mA terminals.
Prerequisites
• ProLink III installed and licensed on your PC
• One of the following:
- RS-232 to Bell 202 signal converter
- USB to Bell 202 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. 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 terminals 1 and 2.
Tip
HART connections are not polarity-sensitive. It does not matter which lead you attach to
which terminal.
c. Add resistance as necessary.
Important
HART/Bell 202 connections require a voltage drop of 1 VDC. To achieve this, add
resistance of 250–600 Ω to the connection.
Using ProLink III with the transmitter
Configuration and Use Manual 285