The beeper may be programmed to announce one, or any combination of these communication events. (See the preceding section “When to Acknowledge” for definitions of the various signals.):
•Good Read — the scanner has successfully read a barcode and sent the message to the Base Station
Good Read
“BEEP”
•WACK / ACK — the Base Station confirms reception and sends a "Wait to Acknowledge" (WACK) signal to the scanner, followed by an "Acknowledge" (ACK) command3.
“BEEP” | WACK | ACK |
(“BEEP”) |
|
(ACK)
•NAK — data sent to the host was faulty or not received; the Base Station sends a "No Acknowledge" (NAK) command to the scanner.
“Bad |
|
|
BEEP” | NAK | NAK |
|
|
GENERAL FEATURES
3In some systems, the ACK response is sent so quickly from the interface that it can override the WACK signal. In this case, the expected beep on WACK is not sounded.
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