Format

Control PC sends:
<STX><FLAG><Command><FileName.length><FileName><ItemNameLength><ItemName><FileBlockNumber><FileData><ETX><LRC>
Device responds:
Success: <STX><FLAG><SucceedCode><FileBlockNumber><ETX><LRC>
Error: <STX><FLAG><FailedCode><INFO><ETX><LRC>

Field	Format	Length	Example	HEX Example	Description
Command	AN	3	"620"	36 32 30	Fixed as 620, command for issuing VSN file, 3 bytes
FileName.length	AN	2	10	31 30	Length of program name as a string, 2 bytes
FileName	AN	As per actual length	Single.vsn	53 69 6E 67 6C 65 2E 76 73 6E 0A	File name
ItemName Length		2	7	30 37	Length of material name, including the extension
ItemName		As per actual length	tt.png	74 74 2E 70 6E 67 0A	Material name; when publishing text programs, the material name can be omitted, set the length of ItemName to 0
FileBlockNumber	AN	5	1	30 30 30 30 31	File block number; if the file does not exceed 2048 bytes, the block number is 1. If it exceeds 2048 bytes, it is sent in blocks with block numbers ranging from 1 to 9999. The maximum size of FileData for each block number is 2048.
FileData	AN	As per actual length	/	/	File data, maximum 2048 bytes per transmission