iDP3420/3421/3423 User’sMa nual
84 CITIZEN
*ETX-STX Mode
STX/ETX Mode Start
Sends ENQ
Receives Status
Data BufferEmpty ?
SendsSTX
OddParity Check ?
Sets Test Byte To
FFH Sets Test Byte To
00
Exclusive ORs TestByte
andSent Data Test B yte
SendsData toPrinter
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
StatusError ?
Sends ENQ
CheckByte
=TestB
y
te?
YES
NO
YES
(Print) SendsCAN
STX-ETX Mode Data
Block Ready to Send ?
NO
RET
NO