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QUERY
Slave address
Function
Data address
Data value
Error check field CRC
The format of a force multiple coil (15) or a preset multiple registers (16) function is as
follows:
QUERY
Slave address
Function
Data address
Quantity of points
Byte count
Data values
Error check field CRC
The format of a read/write multiple registers (23) function is as follows:
QUERY
Slave address
Function
Read data address
Read quantity of points
Write data address
Write quantity of points
Byte count
Write data values
Error check field CRC
The format of a Mask/write register (22) function is as follows:
QUERY
Slave address
Function
Data address
And mask
Or mask
Error check field CRC
3.5 Fetch comm event counter (function 11)
The controller's event counter is incremented once for each successful message
completion. It is not incremented for exception responses, poll commands, or fetch
event counter commands. It returns amount of successful read/write operations on
data points.
The format of a Fetch comm event counter (11) function query is as follows:
16 Modbus function codes ç RVT communication
RESPONSE
Slave address
1 byte
1 byte
Function
Data address
2 bytes
2 bytes
Data value
2 bytes
Error check field CRC
RESPONSE
1 byte
Slave address
1 byte
Function
2 bytes
Data address
2 bytes
Quantity of points
1 byte
Error check field CRC
N bytes
2 bytes
RESPONSE
1 byte
Slave address
1 byte
Function
2 bytes
Byte count
2 bytes
Data values
2 bytes
Error check field CRC
2 bytes
1 byte
N bytes
2 bytes
RESPONSE
1 byte
Slave address
Function
1 byte
2 bytes
Data address
2 bytes
And mask
2 bytes
Or mask
Error check field CRC
2 bytes
1 byte (echo of master's query)
1 byte (echo of master's query)
2 bytes
2 bytes
2 bytes
1 byte (echo of master's query)
1 byte (echo of master's query)
2 bytes
2 bytes
2 bytes
1 byte (echo of master's query)
1 byte (echo of master's query)
1 byte
N bytes
2 bytes
1 byte (echo of master's query)
1 byte (echo of master's query)
2 bytes
2 bytes
2 bytes
2 bytes
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