Worth Data 520-RF Operations Instructions download pdf (Page 22)

with no trimming.) Consider the examples in the following table to

understand how trimming works:

Bar Code Data

Preamble Data Transmitted

123 XYZ XYZ123

12345678 ~3XYZ XYZ45678

12345678 ~9 12345678

12345 ~A 12345

123456 ~5 6

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

preamble of ~b2~c1 says trim 2 characters from the front of Code 39 output and

trim 1 character from the front of UPC-A. Refer to the Code 128 parameter on

page 13 for a list of the ID character associated with each bar code type.

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.

The default is no postamble. To select a postamble, scan up to 15 characters

from the "FULL ASCII MENU" on the back of the Reader Setup Menu, and

then scan SET when you're done. To return to the no postamble 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 hex digit, 1 through F. (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:

Bar Code Data

Postamble Data Transmitted

123 XYZ 123XYZ

12345678 ~3XYZ 12345XYZ

12345678 ~9 12345678

12345 ~A 12345

123456 ~5 1

Bar codes that are shorter than the sum of the Postamble trimming and

Preamble trimming will be transmitted without trimming. Selective trimming

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 63 64

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Worth Data 520-RF Operations Instructions Page 22