Figure 18: Ack/Nak Transmission; Figure 19: Ack/Nak Flowchart - Opticon MDI-4000 Series Serial Interface Manual

Scan Engine
TxD
RxD
BUZZERn
Decode
Finish

Figure 18: ACK/NAK Transmission

Start of transmission
Transmit data
Start 1 sec. timer As configured
Response received
No
No
Timer ended
Yes
ERROR Buzzer

Figure 19: ACK/NAK Flowchart

ACK/NAK Timeout Commands
Command
[XI4
[XI5
[XI6
[XI7
LabelA
Send
ACK Wait Buzzer
Yes
Response = NAK
No
Response = ACK
No
Response = DC1
No
ERROR Buzzer
END
ACK/NAK Timeout
Indefinitely
100 ms
500 ms
1 s
MDI-4000 Series Serial Interface Manual
Host System
LabelB
ACK
LabelB Read
Processing
Yes
Yes
Yes
GOOD READ Buzzer
RxD
TxD
Default
✓
25