Hand Held Products SCANTEAM 2070 BASE, Manual

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1–13 Cordless System Manual
Communication Between the Cordless System and the Host
Host system confirmation may be implemented with a bi-directional interface like
Host RS-232. In this configuration, when the base unit receives the scanned
data from the scanner and forwards it to the host, the Cordless System waits for
a signal from the host that it received the data. (For information on enabling this
feature and using Host Escape commands, see Host Ack Selection, page 3–5).
The Cordless Scanner provides immediate feedback in the form of a “good read”
indication (a green LED on the scanner and an audible beep) after a bar code
is scanned correctly and the base has acknowledged receiving the data. The
Cordless System also provides two way communication between the Scanner
and the base or host system.
If the Cordless System is configured for a keyboard wedge host interface, a
signal (ACK) is sent from the base confirming that the data was received and is
being sent on to the host system. (Since keyboard wedge interfaces cannot
provide bi-directional communications, they do not permit host confirmation.)
Acknowledgement from the Base
Acknowledgement from the Host System
When data is scanned, the data is sent to the host system via the base unit.
Confirmation from the host system or the base indicates that the data sent was
received by the host. The Cordless Scanner recognizes two forms of host
confirmation: data acknowledgement (ACK) from the base unit or an “ACK” from
the host system. If it can’t be determined that the data has been properly sent
to the host system, the scanner issues 4 beeps (low, high, low, high tones). You
must then check to see if the scanned data was received by the host system.
1) Good Read
2) ACK
from
Base
3)
*
* Base sends data to Host after ACK is sent to Scanner
1) Good Read
4) ACK
from
Host
(via base)
2) Data
to Host
3) ACK