IAI America ROBO Cylinder Series - Manual (Page 97)

5. Modbus RTU
89
Modbus
5.3.11 Controller Status Signal Reading 1 <<DSS1>>
(1) Function
This bit reads the internal status of the controller.
[Refer to 4.3.2 (12), “Data of device status register 1.”]
(2) Query format
Field Number of data items
(number of bytes)
RTU mode
8-bit data
Remarks
Start None Silent interval
Slave address [H] 1 Arbitrary Axis number + 1 (01
H
to 10
H
)
Function code [H] 1 03 Register reading
Start address [H] 2 9005 Device status register 1
Number of registers [H] 2 0001 Reading address 9005
H
Error check [H] 2 CRC (16 bits)
End None Silent interval
Total number of bytes 8
(3) Response format
A response message contains 16 bits of data per address.
Field Number of data items
(number of bytes)
RTU mode
8-bit data
Remarks
Start None Silent interval
Slave address [H] 1 Arbitrary Axis number + 1 (01
H
to 10
H
)
Function code [H] 1 03 Register reading
Number of data bytes [H] 1 02 Reading 1 register = 2 bytes
Data [H] 2 Status 1 Status 1 [Hex]
Error check [H] 2 CRC (16 bits)
End None Silent interval
Total number of bytes 7