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STX-ETX
Explanation：
STX-ETX： Only available for RS-232. Add STX’s ASCII before
output barcode and ETX’s ASCII after output barcode
Intercharacter time-delay
*0 millisecond 5 millisecond
10 millisecond 25 millisecond
50 millisecond 100 millisecond
200 millisecond 300 millisecond
