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*ETX-STX Mode
STX/ETX Mode Start
Sends ENQ
Receives Status
Data Buffer Empty ?
Sends STX
Odd Parity Check ?
Sets Test Byte To
FFH
Sets Test Byte To
00
Exclusive ORs Test Byte
and Sent Data
Test Byte
Sends Data to Printer
Last Data in 1 Block ?
1
1
NO
YES
YES
NO
YES
Receives Status
Receives Check Byte
Sends ETX
STX-ETX
Mode End
NO
YES
Status Error ?
Sends ENQ
Check Byte
= Test Byte ?
YES
NO
YES
(Print)
Sends CAN
STX-ETX Mode Data
Block Re ady t o Send ?
NO
RET
NO