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Reference Manual
00809-0100-4811, Rev DA
Appendix C: Rosemount 3300 Series with HART
®
to Modbus
®
Converter
January 2015
Rosemount 3300 Series with HART
®
to Modbus
®
Converter
C.9 Alarm handling
Note
If the Modbus communication setup has been changed, but the transmitter has not yet started
to use the new configuration, then you need to disconnect the HART modem and wait up to 60
seconds for the change to take effect.
In case the MA (+)/MB (-) terminals are used for connection to the HMC, disconnect the RS-485
Converter, cycle power to the transmitter and wait up to 60 seconds for the change to take
effect.
The Modbus communication settings will otherwise be lost if you write a new message to the
transmitter.
The output from the Modbus transmitter in case of an error (such as a field device malfunction)
can be configured. The values for Modbus registers corresponding to PV, SV, TV, and QV will be
changed accordingly (applicable registers in area 1300, 2000, 2100, and 2200).
The default alarm output value for each protocol is defined on the next page. Configuring alarm
output value is optional.
Use the Modbus Message to configure the alarm output. To enter a Modbus Message in RCT, do
the following (Modbus RTU shown):
1. Start RCT and connect to the transmitter.
2. In the RCT workspace Project Bar, select the Setup icon to open the Setup window.
3. Select the Output tab.
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