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The fifth chapter of the communication protocol
The communication protocol defines the ZFM-20 series of the rules of the exchange of information between the module and the host computer.
Whether using the UART hardware
USB interface type, using the same set of communications protocols and instruction set.
If the host computer using a PC, it is recommended that ordered USB interface
Type of module to improve system speed (due to the use of USB upload the image gray level fast, the module can do fingerprint
Collection instrument).
5.1
packet format
Module to communicate with the host computer, the receiving and sending of commands, data, and results are in the form of data packets.
Packet format:
Baotou Address codePacket identification
Packet length packet content (instruction / data / parameters / confirmation code)
Checksum
The packet Detailed definition table
Name
Symbol
Length
Description
Baotou
START 2 bytes
Fixed to 0xef01, and send high byte first.
The default value 0xffffffff, the user can generate a new address by instruction. Module
