Omron NV3Q Series, Connection Manual

Page: 130 / 145

106
Modbus Slave (RTU Mode)
Section 11-1
Function Code 0F: Write multiple internal bits
■ Commands
■ Responses
The response will be the command message with the data from the number of
bytes to byte n removed.
PT slave
address Function
code
0F hex First
address,
upper byte First
address,
lower byte Number of
bits to write,
upper byte Number of
bits to write,
lower byte Number of
bytes Data byte 1
1 byte 1 byte 1 byte 1 byte 1 byte 1 byte 1 byte 1 byte
• • • • • • • • • •
Data byte n Error check,
upper byte Error check,
lower byte
1 byte 1 byte 1 byte
PT slave
address Function
code
0F hex First
address,
upper byte First
address,
lower byte Number of
bits to write,
upper byte Number of
bits to write,
lower byte Error check,
upper byte Error check,
lower byte
1 byte 1 byte 1 byte 1 byte 1 byte 1 byte 1 byte 1 byte
Item Function
PT slave address Specify the slave address of the PT to which to send the message.
For slave address 20, specify 14 hex.
Function code Specify 0F hex.
First address Specify the internal bit address to write in hexadecimal.
For GR12F, specify 00 hex, CF hex.
Number of bits to
write Send the number of the internal bits to write with the upper bytes
first, followed by the lower bytes. To write 20 bits, specify 00 hex,
14 hex.
Number of bytes Specify the number of bytes from data byte 1 to data byte n.
Data bytes 1 to n Send the ON/OFF status of the internal bits starting from the first
bit in units of 8 bits. LSB of byte 1 is the status of the first internal
bit. Status is sent in units of 8 bits. Set bits in byte n that do not
correspond to specified bits to 0.
Error check The CRC-16 values are sent and received.