Instruction Manual

5. Modbus RTU
72
Modbus
5.3.5 Present Time Reading <<TIMN>>
(1) Function
This bit reads the present time.
ᴾ
[Dedicated for PCON-CA/CFA and SCON-CA]
(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 Refer to remarks 841A: SCON-CA
8420: PCON-CA/CFA
Number of registers [H] 2 0002 Reading addresses 8402
H
to
8403
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 register.
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 04 Reading 2 registers = 4 bytes
Data [H] 4 Present Time Refer to (4) for conversion at
time.
Error check [H] 2 CRC (16 bits)
End None Silent interval
Total number of bytes 9