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*ETX-STX Mode
STX/ETX Mode Start
Sends ENQ
Receives Status
NO
Data Buffer Empty ?
Sends STX
Odd Parity Check ?
Sets Test Byte To
FFH
NO
Exclusive ORs Test Byte
and Sent Data
Sends Data to Printer
Last Data in 1 Block ?
YES
NO
YES
Sets Test Byte To
00
YES
Test Byte
1
iDP-3420/3421/3423 User's Manual
1
Sends ENQ
Receives Status
Receives Check Byte
NO
Status Error ?
YES
Check Byte
= Test Byte ?
Sends ETX
(Print)
YES
STX-ETX
Mode End
STX-ETX Mode Data
Block Re ady t o Send ?
YES
NO
Sends CAN
NO
RET
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