Interactive Programming Mode
4-11
4
Frame Acknowledgment
Each frame received is checked for the following identifiers:
•
STX/ETX delimiters
•
Frame number
•
Frame type
•
Checksum
A frame-received acknowledge character (e.g., ACK, NAK) is returned accordingly
().
Figure 4-1 Frame-received Acknowledgment Process Flowchart
The frame is sent again if no ACK/NAK character is received before the end of the
time-out (100 ms by default, value can be modified by setup command), or if a NAK
character is received.
Note:
A maximum of two resend attempts are possible for each frame.
In the following example, the host sends a
deactivate power-up beeps
setup command
to the reader.
Reader <== <STX> <SMC> <Power_beeps_off> <FM> <CHK> <ETX>
0x7F 0x0D 0x45, 0x5A 0x00 0x01,0xB7 0x7F
Содержание Sabre 1555
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Страница 15: ...1 Before You Begin ...
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Страница 21: ...2 Getting Started ...
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Страница 125: ...A Acronyms and Glossary ...
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