Model 3095FB Multivariable Transmitter with Modbus Protocol
Modbus Protocol Guide
Page 13 of 79
2.4 Modbus Function Codes
The transmitter supported function codes listed below include read, write, and diagnostic
commands. See Section 2.6 for examples on reading and writing data with Modbus function
codes.
Table 2-3 Explanation of Function Codes Supported by the Rosemount 3095FB
Function
code
Command
type
Description Explanation of function code
01 Read Read coil status Read ON/OFF status of one coil or con-
secutive coils.
02 Read Read input status Read ON/OFF status of one discrete input
or consecutive discrete inputs.
03 Read Read holding regis-
ters
Read binary values of one or more holding
registers.
04 Read Read input registers Read binary values in one or more input
registers.
05 Write Force coil Set coil to a specified ON or OFF state.
06 Write Load register Write a binary value to a holding register.
08 Diagnostic Loopback diagnos-
tic
Sends diagnostic test message to transmit-
ter to evaluate communications process-
ing.
16 Write Load multiple reg-
isters
Writes values to consecutive holding reg-
isters.
69 Read Read multiple
floating point regis-
ters
Read binary values of one or more 32 bit
floating point registers. This function is
specific to the 3095FB.
70 Write Load multiple
floating point regis-
ters
Write values to consecutive 32 bit floating
point registers. This function is specific to
the 3095FB.
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