Appendix A. Useful Features - Modbus Rtu; Appendix A.1. Managing Floating Points With Modbus; Appendix A.1.1. Transferring Non-Integer Values With One Register - FieldServer FS-8700-01 Driver Manual

FS-8700-01 Modbus RTU/ASCIIFS-8700-01_Modbus_RTU Driver Manual
Appendix A. Useful Features – Modbus RTU

Appendix A.1. Managing Floating points with Modbus

Modbus as a standard does not support floating point formats. Many vendors have written higher level communications software to use two 16 bit registers
to represent floating point or 32 bit integers. This requires conversion software on both ends of the communication channel. The FieldServer supports this
function and also provides other options to resolve this issue.
Appendix A.1.1. Transferring non-integer values with one register
It is possible to represent values higher than 32767 using one register in one of two ways:

Declare data arrays as type Uint16 (Unsigned integer). This will give you a range from 0 to 65535.

Use the scaling function on the FieldServer, which will allow you to set up any range, with 16 bit resolution.
The following example shows how scaling can be achieved on the Server side of the configuration. Note that scaling can also be done on the Client side to
scale down a value that was scaled up by a Modbus vendor. Further information regarding scaling can be found in the FieldServer Configuration manual.
Example :
Map_Descriptors
Map_Descriptor_Name , Data_Array_Name , Data_Array_Offset , Function , Node_Name , Address , Length , Data_Array_Low_Scale , Data_Array_High_Scale , Node_Low_Scale , Node_High_Scale
SMD_AI1 , DA_AI_01
SMD_AO1 , DA_AO_01
This example multiplies the values in the data array by 100 (10000 on Node_High_Scale is 100X larger than 100 on Data_Array_High_Scale). This is most
commonly used when the user wants to introduce values after the decimal point. For example, a value of 75.6 will be sent as 7560, which can then be rescaled
by the Modbus master.
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, 0 , Passive , MBP_Srv_11 , 30001
, 0 , Passive , MBP_Srv_11 , 40001
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, 200 , 0 , 100
, 200 , 0 , 100
, 0 , 10000
, 0 , 10000