167
Modbus RTU function code:
0x 0x01 Read coil 0x05 write single coil
1x 0x02 Read discrete input N/A for write operation
3x 0x04 Read input register N/A for write operation
4x 0x03 Read holding register 0x10 write multiple register
3xbit is equivalent to 3x
4xbit is equivalent to 4x
Wiring diagram:
MODBUS RS232 PORT
MT8000 RS-232
9P D-SUB
COM1 COM2 COM3
Modbus ASCII
Controller RS232
Port
3 TX 4 TX 7 TX RXD
2 RX 6 RX 8 RX TXD
5 GND 5 GND 5 GND GND
RTS
CTS
MODBUS RS422/485 PORT
MT8000
COM1 RS-485 4w
Modbus ASCII Controller
RS422 Port
1 RX- TX-
2 RX+ TX+
3 TX- RX-
4 TX+ RX+
5 GND GND
MT8000 RS-485 2Wire
9P D-SUB
Modbus ASCII
Controller RS485
COM1 COM3
1 RX- 6 Data- D-
2 RX+ 9 Data+ D+
5 GND 5 GND GND
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