Function Protocol Sample Clauses

Function Protocol. 0. Xxxx a single or multiple data（0x03） Read data: Slave responding frame CMD 0x03 CMD 0x03 High bit of the start xx Byte number N*2 N*2 Low bit of the start xx High bit of data 1 xx High bit of data number xx Low bit of data 1 xx Low bit of data number xx xx Check low bit of CRC xx High bit of data N xx Check high bit of CRC xx Low bit of data N xx Check low bit of CRC xx Check high bit of CRC xx 2. Write a single data 0x06 Write data response: High bit of register Add. xx High bit of register Add. xx Low bit of register Add. xx Low bit of register Add. xx High bit of write data xx High bit of write data xx Low bit of write data xx Low bit of write data xx Check low bit of CRC xx Check low bit of CRC xx Check high bit of CRC xx Check high bit of CRC xx 3. Host broadcast frequency and start-stop command(0X20) 4. The error message response Error code Check low bit of CRC Check high bit of CRC Sometimes, errors occurs during the process of the communication. For example, reading or writing data to an illegal address, etc., then the slave will not work as a normal read-write response to reply the host, but send a wrong message frame. Error message frame format is as follows, where the command code is the result of the operation between highest-bit (Bit 7) of host operation and 1 ( read error is 0x83 / write error is 0x86). The error code define as follows: 0x01 Illegal CMD Slave received command code is illegal or does not exist 0x02 Illegal Data Add Slave receives operation addis cross-border operation or illegal 0x03 Illegal Data Slave received data is not within the scope of the function or the range set by other functional limitations is illegal. Slave received the function of the write operation parameters as read-only Slave in operation of the received write operation functions do not modify the parameters in running Slave is busy,ttis mainly occurs when data is stored in memory