Mitsubishi Electric AHU-KIT-SP Manual page 21

●Overview of Modbus communication
・The time from the completion of the request to the start of the response and the time from the completion of the response to the start of the next request are as shown in the figure below.
External controller
Request
(Modbus-master)
AHU Interface
(Modbus-slave)
・The following table shows the data length of the request frame.
Field
Address Slave address
Function Function code
Data Request data
Error check CRC error check
・The data length of the response frame is shown in the table below.
Field
Address Slave address
Function Function code
Data Respons data
Error check CRC error check
Request
Response
Detail Data length
8 bit
8 bit
Variable
16 bit
Detail Data length
8 bit
8 bit
Variable
16 bit
MODEL NAME
Air Handling Unit Interface
MODEL TYPE
AHU-KIT-SP
ISSUE CLASSIFICATION
SPECIFICATION
MORIKAWA
DWG NO.
REV.MARK PAGE
PSZ000Z308
21.09.17
21/38