MODBUS Communication
– MODBUS map
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TI 12J06J01-00EN-P
2. MODBUS map
Data type for Optical Dissolved Oxygen sensor MODBUS map:
Data type
Definition
Float
floating point (4byte, little endian byte swap [CDAB])
IEEE754
NaN: 0x7FFFFFFF
Uint32
32 bit unsigned integer, little endian byte swap [CDAB]
ASCII
character set (using one byte per character), multiple registration possible,
little endian byte swap [CDAB])
Access (load/import) to multiple data types, such as Float, Uint32, ASCII etc., must be
implemented at once. The current version does not support Script yet.
Access
Function
Function Code (hex)
Data Access
16 bits
Read Hold Registers
03
Write Single Register
06
Write Multiple Register
10
Hold Registers are Read only (R) or Read/Write (R/W).
NOTE
The content of this Modbus Map is based upon DO71 firmware YPA 1.4.0.xx and DO72 firmware
YPA 1.4.0.xx