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

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Response
Field name
Function Code
Byte Count
Output Register#0 Hi
Output Register#0 Lo
Output Register#1 Hi
Output Register#1 Lo
In case of address 0x0800, 0x0801 output register value: 0x1122, 0x3344.

7.1.4 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.
Request
Field name
Function Code
Starting Address Hi
Starting Address Lo
Quantity of Register Hi
Quantity of Register Lo
Response
Field name
Function Code
Byte Count
Input Register#0 Hi
Input Register#0 Lo
Input Register#1 Hi
Input Register#1 Lo
In case of address 0x0000, 0x0001 input register value: 0x0080, 0x0000.
Example
0x03
0x04
0x11
0x22
0x33
0x44
Example
0x04
0x00
0x00
0x00
0x02
Example
0x04
0x04
0x00
0x80
0x00
0x00
HX-RIO3 Series