Yamato INE800 Manual page 43

4.1 Slave address
Slave address shall be set in the range from one to 99 beforehand. The master generally performs
transmission with on slave. All of connected devices will receive messages from the master alike
but the slaves that reply to those messages are limited to those slaves that have the same
address as the slave address in the command message.
4.2 Function code
Function code is a function code to be executed by slaves and data pieces are roughly classified
into the following groups.
Analogue settings：Various pieces of setting information. The values shall be within the 16-bit
range.
Analogue input data：Measured data, status and other data. The values shall be within the 16-bit
range.
Code
03 Readout of analogue settings
04 Readout of analogue input data
06 Write of analogue settings
4.3 Data part
Data configuration differs depending on function codes.
Data requested by the master consists of the number of codes and number of data pieces to be
read or written.
Replies from a slave consist of data to the request.
All basic MODBUS data consists of 16-bit integers and whether they have a sign or not depends
on specific data. Thus, values are expressed by allocating the decimal point to a different address
to make them integers or by fixing the decimal point and normalizing the values with the upper
and lower limits of the scale.
4.4 Reference #
Data has a number "Reference #" allocated and which number is necessary for reading out and
writing of that data.
The numbers are classified depending on their types into: "analogue input data" and "analogue
settings".
Data type
Analogue input data
Analogue settings
4.5 Error check
Error check system for transmission frames differs depending on the specific mode.
RTU：CRC－16
ASCII：LRC
-32768 to 32767
Function
30001 ～ 40000
40001 ～ 50000
4. Operating procedures
Setting external communication
Unit Functions unique to MODBUS (for reference)
16 bit Readout of contents in the holding resister
16 bit Readout of contents in the input resister
16 bit Write in the single holding resister
Reference #
39
Relative numbers
Reference #－30001
Reference #－40001