Headrest Rear View Camera Monitor 4.3 Inch Car Reverse Camera With Display Screen

4.3 inch display screen with reverse camera no need to install in car reverse rearview system

Interface Editing
Specialized interface editing software can quickly edit graphical user interfaces   GUIs    and applications   The software contains universal component tools   which are divided into two types   control components and display components     Control components are input objects   Such as function buttons   sliders   radio buttons   etc    Display components are output objects   Like a bar chart    Numeric fields    string fields   etc  . By combining interface images and processes    and applying these component tools     edit and generate the interface that users need . 

communication protocol
In SP043T and embedded devices     external processors are used .  Use ASCII or CRC based communication protocols between them .  The processor of the client device needs to have the ability of RS - 232 serial communication .  The message of SP043T is initialized by a timer event or user input from the touch panel  .
 

Communication format
The communication between SP043T and external processors is asynchronous serial transmission .  Has the following format
Baud rate    9600    14400
19200 .  28800   38400 .  5600057600 .  Or 115200BPS

CRC calculation
The CRC communication protocol uses a 16 bit CRC with cyclic redundancy check..    To ensure the integrity of data  .  Each sent message consists of a slave ID    an SP043T machine code     and message bytes .  And the CRC of the last two bytes .  Slave ID    SP043T machine code .  The message byte runs through the CRC algorithm .  The generated 16 bit CRC is added to the end of each message .  most
The effective bytes of CRC are sent firs   t.
When the host receives an SP043T message .  The calculated CRC should match the last two bytes .  If not   then the packet should be considered incomplete data

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