2 02 (0x02) read discrete inputs, 3 03 (0x03) read holding registers, 4 04 (0x04) read input registers – Yokogawa EJX930A User Manual
Page 33: 5 05 (0x05) write single coil, 02 (0x02) read discrete inputs -2, 03 (0x03) read holding registers -2, 04 (0x04) read input registers -2, 05 (0x05) write single coil -2

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