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you'd scan a 1 and then a 2. Next, the break code. Let's say your computer uses
keycode 2 break codes of F0 followed by the make code. Finally, a right apostrophe
to mark the end of the scan codes. ` 1 2 F 0 1 2 ' (scanned from the Full ASCII
Menu) The preamble is limited to 15 characters. As the single scan code example
above uses eight characters, you can see that you can't put very many keyboard
scan codes in the preamble.
A final use of the Preamble/Postamble is to enter a minimum/maximum length
check for bar code data read. Use the Preamble or Postamble by entering |nnmm
where "|" is ASCII 124, "nn" is the two digit minimum to be read and "mm" is
the two digit maximum to be read.
Postamble
"Postamble" refers to a user-specified data string transmitted at the end of each bar
code. For instance, if you specify the postamble @@ and read data of 123456,
"123456@@" would be transmitted to your computer.
To select a postamble, scan up to 15 characters from the "FULL ASCII MENU" on
the back of the Reader Setup Menu, scanning SET when done. To return to no
postamble (the default setting), scan CLEAR here instead of scanning SET or any
characters from the FULL ASCII MENU.
You can trim 1-15 trailing characters from bar code codes by scanning a ~ (tilde -
- ASCII 126) followed by a single digit, 1 through F (A through F are for 10 to
15). (Bar codes which are shorter than the amount-to-trim are transmitted without
trimming.) Consider the examples in the following table to understand the
options of the Postamble:
123 XYZ 123XYZ
12345678 ~3XYZ 12345XYZ
12345678 ~9 12345678
12345 ~A 12345~A
123456 ~5 1
Bar Code Data Postamble Data Transmitted
Bar codes which are shorter than the sum of the Postamble trimming and Preamble
trimming will be transmitted without trimming.
You can also trim selectively by bar code type. For example, you can trim 2
characters from Code 39 and a different amount from other bar code outputs. This
is done by using the bar code ID character in conjunction with the tilde. A
postamble of ~b2~c1 says trim 2 rightmost characters from Code 39 output and
trim 1 rightmost character from the UPC-A. (Use m for trimming Magstripe).
Refer to the Code 128 parameter's previous discussion for a list of the ID character
associated with each bar code type.
For advanced PC users: Emulating special keys in the postamble