This Blog was created to help people solve bar code and data collection applications with Microscan bar code readers and vision systems.

Friday, March 09, 2007

Why is there a period at the beginning of my bar code data?


If you're using a USB keyboard wedge version
of the Microscan Quadrus Mini or the MS-4, you
may notice a "." at the beginning of the 2nd line of data.

This is the LF from the previous bar code's postamble.
In keyboard wedge mode, configure the postamble to just
be CR and not the default CR LF.

Wednesday, March 07, 2007

How to integrate a latching/unlatching relay when you are out of inputs

Many of Microscan's bar code scanners and imagers have the ability to have an output latch. The problem comes when you need to unlatch. You need an input to unlatch such as the new master pin or the trigger pin. But chances are, you're already using them for the application. Only the 890 with a wiring box has an extra input. The above picture is of a magnetic latching relay. You can send it a pulse and it will latch. It just requires a toggle switch to the extra coil to reset the relay.
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