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UFOM SDK Developer’s Manual
2.1 2.1 Packet Structure Communication between main controller and UFOM is executed with a 20-byte packet. In case a field is composed of 2 bytes, the lower byte becomes the first byte of the field and the higher byte becomes the second byte (Little Endian).
1Byte
1Byte
2Byte
4Byte
4Byte
4Byte
2Byte
1Byte
1Byte
Start
Command
wParam
Param1
Param2
exDatalen
ErrorCode
Checksum
Exchecksum
Start Command
Start of packet (0x02) command field
wParam
System Id
Param1
The first parameter where data to be transmitted if any
Param2
the second parameter where data to be transmitted if any
ExDatalen
when more data transmitted, here comes the value of the length of the extradata
ErrorCode
the execution result of the command
Checksum
used for communication error detection
ExChecksum ExChecksum
used for communication error detection(extradata)
In Command field, commands to be executed by UFOM are written. For more details about how to use each command, see Appendix A Protocol Reference. Some commands need parameters to transmit. If there are any parameters to transmit, data is transmitted with wParam, Param1 and Param2. When there are more data to be transmitted other than wParam, Param1, and Param2, that is, when it is necessary to transmit more than 10 byte data, ExDatlen field is used. On ExDatlen, length of data to be transmitted rather than the data itself is written. Checksum field is used for detecting communication error, on which the value adding up each byte of the packet (Start ~ ErrorCode, 18byte) and exChecksum field is used for detecting communication error in extradata, on which the value adding up each byte of the extra packet is written.
