
194
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
4. Select Modbus Setup.
5. Enter the Modbus Message, and select OK.
See below for available Alarm Output Modbus Messages.
Modbus RTU
Levelmaster
Modbus ASCII
Note
After changing the Alarm Output configuration, 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.
C.9.1 Verify alarm output
To verify the alarm output, simulate a device failure by removing the transmitter head. For
instructions on removing the transmitter head and re-attaching it, see “Removing the
transmitter head” on page 110.
Message Alarm Output
HMC EN Not a number (NaN), default
HMC EF Freeze, hold last value
HMC EU U-0.1 User defined value, -0.1 in this example
Message Alarm Output
HMC M2 EH High value, 999.99, default
HMC M2 EL Low value, -99.99
HMC M2 EF Freeze, hold last value
HMC M2 EU U0 User defined value (range -99.99 to 999.99), 0 in this example
Message Alarm Output
HMC M1 EN Not a number (NaN), default
HMC M1 EF Freeze, hold last value
HMC M1 EU U-0.1 User defined value (range -99.99 to 999.99), -0.1 in this example
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