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The ATS48 needs to have a fault reset sent over Modbus.
All models and serial numbers.
Fault reset is performed when bit 7 of command word 400 transitions from 0 to 1. Write decimal 128 to register 400. If there is an offset then write decimal 128 to register 401. Once the reset has been performed write a decimal 0 to the register to reset bit 7 to 0 to allow transition when the next reset is performed.