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Through what command can you send 400 bytes of data?
Can modbus be used to transfer information?, for example, send 100 em-marine cards to the device, 4 bytes each = 400 bytes, many examples describe commands for reading or setting inputs / outputs, I have no idea how this can be implemented.
01 (0x01) Чтение DO Read Coil Status Дискретное Чтение
02 (0x02) Чтение DI Read Input Status Дискретное Чтение
03 (0x03) Чтение AO Read Holding Registers 16 битное Чтение
04 (0x04) Чтение AI Read Input Registers 16 битное Чтение
05 (0x05) Запись одного DO Force Single Coil Дискретное Запись
06 (0x06) Запись одного AO Preset Single Register 16 битное Запись
15 (0x0F) Запись нескольких DO Force Multiple Coils Дискретное Запись
16 (0x10) Запись нескольких AO Preset Multiple Registers 16 битное Запись
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You can use it, but you cannot transfer more than 120 bytes in one request.
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