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Hi,
I am using citectSCADA to read current/voltage value from power meter via Modbus TCP/IP protocol.
I figured out Modbus function 03 shall be used to get the reading.
Things I do not understand is:
function code 03 shall be used to read holding register (analog out)
function code 04 shall be used to read input register (analog input)
In my case, I am trying to read analog input.
Can anyone explain why code 03 shall be used rather than 04?
Thanks,
Jason
I am using citectSCADA to read current/voltage value from power meter via Modbus TCP/IP protocol.
I figured out Modbus function 03 shall be used to get the reading.
Things I do not understand is:
function code 03 shall be used to read holding register (analog out)
function code 04 shall be used to read input register (analog input)
In my case, I am trying to read analog input.
Can anyone explain why code 03 shall be used rather than 04?
Thanks,
Jason