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usually you need to configure the reader to tell it what kind of barcodes you want it to read and how to interpret & output the codes to your computer (whether you need prefix or suffixes to your codes( for automation))
the user manual for the reader has some bar codes to configure the settings for the scanner.
<p>The primary purpose of bar codes is to encode the unique
characteristics of numbers and letters can be in a format that machines can
easily read. However, bar codes are read by people often also for this reason,
the codes generally include both parties readable and legible. The most popular
bar codes meet a standard called "Code 39". The latest version of the
code with 39 additional characters called "Extended Code 39." Among
other characters, Extended Code 39 allows users to include carriage returns
(CR) in bar codes. <br />
<p>1. Setting the bar code scanner to read "Extended Code
39," Code 39 is not as common support CR. The details depend on the
specific bar code scanning software is used, but you will usually find this
option under "Tools" then "Options." <br />
<p>2. Configure the software to generate bar code to the
"Extended Code 39" is also used. The details depend on the specific
software to generate barcode is used, but you will usually find this option
under "Tools" then "Options." <br />
<p>3. Type "M $" (without the quotes) at the point
where you want the CR model is within the barcode. M $ gives a CR Extended Code
39. <br />
the USPS barcode is the GS1 128 (Code128) that will help you by activating accoring to the manual. Please be sure that you enable all lenghts of the Code128 barcode. That is probably the issue.
the metrologic scanner you are talking about has a barcode in the maual under the keyboard wedge section it is called stand alone keyboard this will cure your problem when you scan it.
the reason being it fools the scanner into thinking there is a keyboard connected.
hope this helps
In the user manual for this device there should be a code book (or code pages), These are a selection of barcodes which you use to configure the device.
One of the settings is to omit the barcode header (which indicates a type of barcode for instance a PART number might begin with P or a Serial number might begin with an S) This barcode system may have been initially programmed to omit these code letters