CHAPTER 13 RS-485 COMMUNICATIONS
13-44
PC Loader Communications
13
13.2.10 Protocol Level Error
If an error (data error) is found in the protocol, the amplifier does not process the transmission message
but it sends error data in "status data (STR1)" of the response message.
For the description of STR1, refer to "13.2.5 Status Data."
It is recommended to check error data during development of host application software.
Debug the protocol according to the error data.
The data error is caused if there is an error in the transmission message data (header, BCC, setting
range of parameter data, etc.). Correct data.
A command reception error is caused if parameter writing is attempted in the parameter write
protection state. Check the setting of parameter PA2_74 (parameter write protection).
In the LV (under voltage) state, memory access to the amplifier is limited and command acceptance
may be rejected if parameter reading or writing or alarm history reading is attempted. Check the
power supply state.
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