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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
P
O
W
E
R
C
H
A
R
G
E
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
3
.
P
O
W
E
R
C
H
A
R
G
E
T
X
/R
X
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.
P
O
W
E
R
C
H
A
R
G
E
TX/RX
NAK
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.