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189
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
Modbus RTU Parameter Configuration Example
You want to use address 44 for the 3300 transmitter, and the following communication
parameters are used by the host:
Table C-4. Communication Parameters Used by the Host (example)
To configure the Rosemount 3300 Series Transmitter to communicate with the host in this
example, the following text string is written to the HART Slave 1 Message Area:
HMC A44 B4800 PO S2.
HMC: These three letters are used for safety and will eliminate the risk of changing the
configuration data by mistake.
A44: A indicates that the following number is the new address (address 44). Leading zeroes are
not needed.
B4800: B indicates that the following number is the new baud rate (1200, 2400, 4800, 9600,
19200).
PO: P identifies the following letter as parity type (O = odd, E = even, and N = none).
S2: S indicates that the following figure is the number of stop bits (1 = one, 2 = two).
Only values that differ from the current values need to be included. For example, if only the
address is changed, the following text string is written into the 3300 (HART Slave 1) Message
Area:
HMC A127,
indicates that 127 is the new address.
C.8.4 Levelmaster communication setup
The default and configurable parameter values can be found in Tab le C- 5.
Table C-5. Levelmaster Communication Parameters
Parameter Value
Baud Rate 4800
Start Bits One
Data Bits Eight
Parity Odd
Stop Bits Two
Parameter Default value Configurable value
Baud Rate 9600 1200, 2400, 4800, 9600, 19200
Start Bits One One
Data Bits Seven Seven, Eight
Parity None None, Odd, Even
Stop Bits One One or Two
Address 1 1-99
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