Modbus Communication - Mitsubishi Electric AHU-KIT-SP Manual

11. Modbus communication

・X5 is Modbus communication connector.
・Modbus communication specifications are as follows.
Item Specification
Transmission mode RTU (remote terminal unit)
(1) 9600bps
Transmission speed
(2) 19200bps
Data bit 8
(1) Non parity + 2 stop bits
Parity/stop bit
(2) Even parity + 1 stop bit
Node number
01～99 (initial：01)
(slave address)
Connection RS-485 communication
Modbus master:
External controller : 1pcs
Combinations
Modbus slave:
AHU interface :1pcs
・Modbus can monitor the status of the AHU interface and outdoor units.
Modbus can also change some settings.
●Modbus function
・The function codes are as follows:
Function code Function name
3 (0x03) Read holding register
4 (0x04) Read input register
6 (0x06) Preset single register
16 (0x10) Preset multiple registers
●Modbus data information
・Modbus data type, data length and address allocation range are as follows.
Target register Data length
Input register 2 byte
Holding register 2 byte
Note
DipSW7-2 ON
DipSW7-2 OFF
DipSW7-3 ON
DipSW7-3 OFF
RotarySW5: ones place
RotarySW6: tens place
X5-1: A polar
X5-2: B polar
X5-3: GND
Read the contents of the holding register
Read the contents of the input register
Change the contents of the holding register
Change the contents of multiple consecutive holding registers
Type of access Register address range
Monitoring only 30001 ～ 39999
Monitoring / control 40001 ～ 49999
Remarks
MODEL NAME
Air Handling Unit Interface
MODEL TYPE
AHU-KIT-SP
ISSUE CLASSIFICATION
SPECIFICATION
MORIKAWA
DWG NO.
REV.MARK PAGE
PSZ000Z308
21.09.17
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