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GENERAL
FEATURES
82
SP400RF
Programming Guide
OPTION 3 — SEND ACK TO THE SCANNER AFTER CTS IS ENABLED FROM THE HOST.
RS-232 FEATURE ONLY.
WACK MODE DISABLED—ACK will be sent immediately, once the
radio layer of software detects a valid transmission from the
scanner. With WACK Mode disabled, ACK is sent to the
scanner regardless of what the interface layer (software) has
done or is doing.
WACK MODE ENABLED
2
—WACK is sent
3
once the radio layer
(software) validates the message, then ACK is sent to the
scanner once the interface layer (software) validates the
transmission from the scanner, has sensed the CTS being
enabled and has received an ACK from the host (if the
interface supports handshaking).
P
O
W
E
R
CH
A
RGE
TX/RX
CTS enabled
WACK
3
ACK
WACK MODE RECOMMENDATION
It is recommended that WACK Mode be enabled to ensure the best, most
accurate performance. Scanner response will seem quicker when WACK
Mode is disabled, however, there is a greater chance that the scanner will
erroneously respond with a"Good Read" beep when the host has not
received the message, or is not ready for a message. As described in the
options above, this is because the interface layer status is not checked to
ensure its readiness to receive a message from the radio.
2 When WACK mode is enabled, wait time for host acknowledgement is a critical
setting. Reference the feature in this section titled "
Wait Time for Host Acknowledge
".
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 WACK is never perceived by the scanner.