0X03) Read Holding Registers; 0X04) Read Input Registers - Hitachi HX-RIO3 Series User Manual

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- In case of address 0x0015~0x0000 input bit value: 00000000_10000000.

6.2.3. 3(0x03) Read Holding Registers

This function code is used to read the contents of a contiguous block of holding registers in a remote device.
The Request PDU specifies the starting register address and the number of registers.
The register data in the response message are packed as two bytes per register, with the binary contents
right justified within each byte. For each register, the first byte contains the high order bits and the second
contains the low order bits
- In case of address 0x0800, 0x0801 output register value: 0x1122, 0x3344.

6.2.4. 4 (0x04) Read Input Registers

This function code is used to read from 1 to approx. 125 contiguous input registers in a remote device. The
Request PDU specifies the starting register address and the number of registers. The register data in the
response message are packed as two bytes per register, with the binary contents right justified within each
byte. For each register, the first byte contains the high order bits and the second contains the low order bits.
This function code is used to read from 1 to approx. 125 contiguous input registers in a remote device. The
Request PDU specifies the starting register address and the number of registers. The register data in the
response message are packed as two bytes per register, with the binary contents right justified within each
byte. For each register, the first byte contains the high order bits and the second contains the low order bits.
• Response
Field name
Function Code
Byte Count
Output Status
Output Status
• Request
Field name
Function Code
Starting Address Hi
Starting Address Lo
Quantity of Inputs Hi
Quantity of Inputs Lo
• Response
Field name
Function Code
Byte Count
Output Status
Output Status
Example
0x02
0x02
0x80
0x00
Example
0x02
0x00
0x00
0x00
0x0A
Example
0x02
0x02
0x80
0x00
HX-RIO3 Series