User guide

<5. Modbus Communication>
5-2
IM 01C25R05-01EN
5.4.2 02 (0x02) Read Discrete Inputs
Specied quantity of Discrete Inputs contents is
read from Specied Starting Address.
Not corresponding to Broadcast.
Request
Items Size [byte] Data
Address 1 1 to 247
Function code 1 0x02
Starting Address 2 0x0000 to 0xFFFF
Quantity of Inputs 2 -
CRC 2 -
Response
Items Size [byte] Data
Address 1 1 to 247
Function code 1 0x02
Byte count 1 N
*1
Input Status
*2
N
*1
CRC 2 -
*1: N is 1 when quantity of Discrete Inputs is less than or
equal to 8.
*2: e.g. When reading address is 1000 – 1007, MSB is 1007
and LSB is1000.
5.4.3 03 (0x03) Read Holding Registers
Specied quantity of Holding Registers contents is
read from Specied Starting Address.
Not corresponding to Broadcast.
Request
Items Size [byte] Data
Address 1 1 to 247
Function code 1 0x03
Starting Address 2 0x0000 to 0xFFFF
Quantity of
Registers
2 -
CRC 2 -
Response
Items Size [byte] Data
Address 1 1 to 247
Function code 1 0x03
Byte count 1 N
*1
×2
Register value
*2
N
*1
×2
CRC 2 -
*1: N: The quantity specied by the Quantity of Registers.
*2: Transmitted by the order: Upper- Lower from the specied
Starting Address.
E.g. 10 in FLOAT format, Transmit order is as
0x41200000.
5.4.4 04 (0x04) Read Input Registers
Specied quantity of Input Registers contents is
read from Specied Starting Address.
Not corresponding to Broadcast.
Request
Items Size [byte] Data
Address 1 1 to 247
Function code 1 0x04
Starting Address 2 0x0000 to 0xFFFF
Quantity of
Registers
2 -
CRC 2 -
Response
Items Size [byte] Data
Address 1 1 to 247
Function code 1 0x04
Byte count 1 N
*1
×2
Register value
*2
N
*1
×2
CRC 2 -
*1: N: The quantity specied by the Quantity of Registers.
*2: Transmitted by the order: Upper- Lower from the specied
Starting Address.
E.g. 10 in FLOAT format, Transmit order is as
0x41200000.
5.4.5 05 (0x05) Write Single Coil
Write data to Coil of Specied Output Address.
Corresponding to Broadcast.
Request
Items Size [byte] Data
Address 1 1 to 247
Function code 1 0x05
Output Address 2 0x0000 to 0xFFFF
Output Value 2 0x0000 or 0xFF00
*1
CRC 2 -
*1: OFF; 0x0000, ON; 0xFF00
Response
Items Size [byte] Data
Address 1 1 to 247
Function code 1 0x05
Output Address 2 0x0000 to 0xFFFF
Output Value 2 0x0000 or 0xFF00
CRC 2 -