Modbus setting method
Modbus communication is available on this model. Follow the procedure below to set.
1. Wiring method
*1: Set the baud rate according to the communication device.
*2: Up to 16 addresses can be set with the rotary switch.
*3: Set the terminating resistor only for the unit with the latest address.
• RS-485 terminator resistor select switch SW801 (Bit1).
• For SW801 Bit1 (120 ohm), set only the Dx-interface with the latest address, and turn off Bit1 for other Dx-interfaces.
2. Function codes
Baud Rate *1 SW506
Bit1: ON / Bit2: OFF
(19200)
Bit1: ON / Bit2: OFF
(19200)
...
Bit1: ON / Bit2: OFF
(19200)
Address *2 SW507 1 2 ... 16 (Up to 16)
Termination
resistor *3
SW801 Bit1: ON Bit1: OFF ... Bit1: OFF
Function code Sub function code Function name
0×03 None Read holding register
0×04 None Read Input register
0×06 None White single holding register
0×08 0×00, 01, 02, 04, 0A, 0B, 0C, 0D, 0E, 0F, 11, 12, 14 Diagnostics
0×0B None Get Comm. Event Counter
0×0C None Get Comm. Event Log
0×10 None Write multiple holding registers
Uv
Uv
MdA MdB
Uv
MdA MdB
Uv
MdA MdB
Note:
When connecting multiple communication lines,
connect MdA-MdA and MdB-MdB to each other.
(There is polarity)
Outdoor unit
Dx-coil interface
Modbus A line
Modbus B line
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