Agrowtek GrowControl GCX Instruction Manual page 116

Control Function Registers
Control function values can be accessed if a MODBUS register is set for the speci c control function setting.
This allows read and write of control parameters using MODBUS registers.
Device Address
Access to control functions is performed through device address 201.
Register Index
Function registers are accessed by setting a primary register which subsequent registers are indexed from.
The user or integrator must set an index register for each function setting to access the settings.
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1. Enable Modbus
2. Register Index
3. Register Preview
Accessing Registers
The settings are accessed by sending read-register requsts to device address 201, at the index or speci c
register number requested according to the o set tables on the following pages. Multiple registers can be
requested up to the Modbus limit.
For example; requesting the registers from the graphic above for the "Function Status" and "Function Value" :
Device Address = 201
Start Register = 1000
Number of Registers = 2
For a complete listing of function registers, please reference the MODBUS manual available at:
116
Enable access to the function registers with MODBUS (administrator only.)
Number to use as the rst (index) register for accessing the settings.
Displays the range of registers used for this setting according to the index.
https://agrowtek.com/doc/im/IM_MODBUS.pdf
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