PSC SP400rf Scanner User Manual


 
GENERAL
FEATURES
R44-1027 81
OPTION 1 — SEND ACK TO THE SCANNER ONCE BASE STATION RECEIVES A MESSAGE.
WACK MODE DISABLEDACK 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 and has received an ACK from
the host (if the interface supports handshaking).
POWER
C
H
A
R
G
E
T
X
/
R
X
ACK
1
OPTION 2 — SEND ACK TO THE SCANNER AFTER MESSAGE IS TRANSMITTED TO THE HOST.
WACK MODE DISABLEDACK 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 sent the full message to
the host, and has received an ACK from the host (if the
interface supports handshaking).
P
O
W
E
R
C
H
A
R
G
E
T
X
/R
X
WACK
ACK
2
ACK
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 Acknowl-
edge
".
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.