Fig. 2.06. Handshaking Ack/Nak; Fig. 2.07. Handshaking Ack/Nak No Response - Opticon UNIVERSAL MENU BOOK Command Manual

Response: "None"
Action: If there is no response within one
second then the reader terminates
transmission with an error buzzer. See figure
2.06.
Fig. 2.06. HandShaking
ACK/NAK
Start of
transmission
Transmit
data
Start 1 sec.
timer
Answer
Yes
received
No
No
Timer
ended
Yes
ERROR
Buzzer
END
OPTICON Universal menu book
Answer
= NAK
Yes
No
Answer Yes
= ACK
No
Yes
Answer
= DC1
No
ERROR GOOD READ
Buzzer Buzzer
6. ACK/NAK no response:
The difference from the ACK/NAK mode is that
when no response from the host is received
within 100 ms, the reader assumes that the
data has been received correctly by the host.
Response: "ACK" (ASCII: Hex Ø6)
Action: The reader completes transmission with
the good-read buzzer.
Response: "NAK" (ASCII: Hex 15)
Action: The reader sends the data again.
Response: "DC1" (ASCII: Hex 11)
Action: The reader completes transmission
without a good-read or error buzzer.
Response: "None"
Action: If there is no response within 100 ms
then the reader terminates transmission with a
good read buzzer. See figure 2.07.
Fig. 2.07. HandShaking
ACK/NAK no response
Start of
transmission
Transmit
data
Start 100 ms.
timer
Answer
Yes
received
No
No
Timer
ended
Yes
GOOD READ
Buzzer
U12
Answer
= NAK
Yes
No
Answer Yes
= ACK
No
Yes
Answer
= DC1
No
ERROR GOOD READ
Buzzer Buzzer
END