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Сообщение от LordN
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Вроде норм всё.
Посмотрите в логе код ошибки, какому именно соответствует:
0x02: Permissible range of the holding registers 0xD000 to 0xD37F was exceeded
0x03: Maximum telegram length for response (23 bytes) exceeded, i.e. either more than 9 holding registers or 0 holding registers were requested.
0x04: A holding register cannot be read due to a defect in the electronics