Opticon MDI-4000 Series, Руководство по последовательному интерфейсу, Страница: 38 / 139

MDI-4000 Series Serial Interface Manual
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ACK/NAK No Response
ACK/NAK No Response is different from ACK/NAK mode in that if no response is received from
the host within 100 ms, the scan engine assumes that the data has been successfully received
by the host.
ACK/NAK No Response Host Responses
Response Description
"ACK" (ASCII:0x06) The scan engine terminates transmission with the good-read buzzer.
"NAK" (ASCII:0x15) The scan engine sends the data again.
"DC1" (ASCII:0x11) The scan engine terminates transmission without the good-read or error buzzer.
Timeout If there is no response within 100 ms, the scan engine terminates transmission
with the good-read buzzer.
Figure 20: ACK/NAK No Response Flowchart
4.1.7 Inter Character Delay (UART)
Inter character delay adds a configurable delay after each transmitted character. This delay can
be helpful if the host does not support flow control and is not capable of handling the received
data.
To activate and save the new configuration, you need to use the Z2 command (save settings in
non-volatile memory).
Inter Character Delay Commands (UART)
Command Delay Default
KA No delay
✓
KB 20 ms
KC 50 ms
KD 100 ms
Start of transmission
Transmit data
Start 100 ms. timer
Response received
Timer ended
Response = NAK
Response = ACK
Response = DC1
GOOD READ Buzzer ERROR Buzzer GOOD READ Buzzer
END
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No