PSC SP400rf Uživatelský manuál stáhnout pdf (Strana 91)

GENERAL

FEATURES

R44-1027 85

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

TX/RX

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) command

ACK

“BEEP”

(“BEEP”)

WACK

(ACK)

• NAK — data sent to the host was faulty or not received; the Base

Station sends a "No Acknowledge" (NAK) command to the

scanner.

TX/RX

NAK

“Bad

BEEP”

3 In 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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PSC SP400rf Uživatelský manuál Strana 91