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Manual Supplement
00809-0500-4530, Rev AA
October 2010
Rosemount 5300/5400 Series
1-30
SPECIFIC MODBUS
HOST CONFIGURATION
The Remote Terminal Unit needs to be configured to communicate and
correctly interpret data when reading input registers from the Rosemount
5300/5400 transmitter.
Baud Rate
The specified Baud Rates below are recommendations. If other Baud Rates
are used, make sure that the 5300/5400 and the RTU are configured for the
same communication speed.
Floating Point Format Code
See Section “Common Modbus Host Configuration” on page 1-25.
RTU Data Type
The RTU Data Type specifies which configuration to use in the RTU in order
for the RTU to correctly interpret a floating point number transmitted from the
5300/5400 transmitter with Modbus.
Input Register Base Number
Data registers in the 5300/5400 transmitter with Modbus are numbered
exactly as they are transmitted in the Modbus communication. Some RTUs
use different naming conventions and to configure the RTU to poll the correct
registers from the 5300/5400 Modbus, an Input Register Base Number is
stated for each RTU respectively. E.g. if the input register base number is 1
for the RTU, the 5300/5400 Modbus input register 1302 has to be entered in
the RTU address as input register 1303.
Emerson Process Management
ROC800 Series
Figure 1-9. Wiring Diagram for
Connecting 5300/5400 Modbus to
Emerson Process Management
ROC800 Series
Table 1-19. Parameter Values (in
case of Emerson Process
Management ROC800 Series)
The Input Register Base Number needs to be added to the Input Register
address of the 5300/5400 transmitter. In this case, register 1300 needs to
have 1300 entered as the address.
Parameter Value
Baud Rate 9600
Floating Point Format Code 0
RTU Data Type Conversion Code 66
Input Register Base Number 0