<JLIP technical information>

Data style of transmit and receive

JLIP device always transmit and receive 11 bytes data. Command frame It is a data sequence that contains control operation command from master controller like PC to slave device like VCR. It consists of the explanation below. Header (2 bytes)            : 0xFF + 0xFF ID        (1 byte)            : one of number from 1 to 99 , or 127 Command body(7 bytes) : command operation code and parameters (*1) Check sum (1 byte)    : complement of the sum of other ten bytes of command frame data (*2)    *1: refer to another document    *2: maximum bit is always 0 -- method of calculation is below. Return frame It is a data sequence that contains result of command operation from from slave device like VCR to master controller like PC. It consists of the explanation below. Header (2 bytes)          : 0xFC + 0xFF ID        (1 byte)           : one of number from 1 to 99 Return body(7 bytes)    : result or information of command operation (*3) Check sum (1 byte)    : complement of the sum of other ten bytes of command frame data (*4)    *3: refer to another document    *4: maximum bit is always 0 -- method of calculation is below. The first byte of 7 bytes-'Return body' is called 'command status', and it is for checking command acceptance. (*3) A maximum bit of every data except header data is always zero in JLIP. Check sum data A method of calculate check sum is like this. r1 = (1st)+(2nd)+(3rd)+(4th)+(5th)+(6th)+(7th)+(8th)+(9th)+(10th) result = (256 - (r1 mod 256) ) mod 128    *5: 'mod' is a operator that is for calculating remainder

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