Host Acknowledgment - Honeywell ORBIT 7120PLUS User Manual

Host Acknowledgment

Some applications require that the host terminal (or server) validate incoming bar
code data (database look-up) and provide acknowledgment to the scanner
whether or not to proceed. In Host ACK Mode, the scanner waits for this acknowl-
edgment after each scan. Visual and audible acknowledgments provide valuable
feedback to the scan operator. The Host ACK functionality is controlled via a num-
ber of pre-defined escape commands that are sent to the scanner to make it
behave in different ways.
Note: System performance degrades when using Host ACK at rates lower than 9600 baud.
The following criteria must be met for the Host ACK to work correctly:
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The commands to which the scanner responds are listed on
1B in hex. A typical command string is [ESC] x, where "[ESC] x" is the escape com-
mand and the comma is the terminator, which is required.
Example: Commands may be strung together to create custom response sequences. An
example of a command string is listed below.
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The above example will make a scanner zero beep low, then medium, then high.
Example: A good read beep is required for any item on file, but a razz or error tone is required
if the item is not on file. In this case,
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44
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The scanner must be configured for Host Port RS232 (terminal ID = 000) or USB
COM Emulation (terminal ID = 130).
RTS/CTS is defaulted off. You must enable it if the host system requires it.
Host ACK must be set to On
A comma must be used as a terminator.
The host terminal software must be capable of interpreting the bar code data,
make decisions based on the data content, and send out appropriate escape
commands to the scanner.
[ESC]4,[ESC]5,[ESC]6,
[ESC]7, is sent from the host to the scanner for an on-file product
[ESC]8,[ESC]8, is sent from the host to the scanner for a not-on-file product
(page 45).
Orbit 7120plus/7190g User Guide
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page 45. The [ESC] is a