Argox AS-8020CL - Manual (Page 131)

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String setting / Transmission
(Preamble/Postamble)
Preamble/ Postamble characters: Preamble or Postamble
characters will be appended to the data automatically for all
symbologies. However, the transmission will not activate
unless Preamble / Postamble transmission is enabled.
Preamble transmission: By setting Enable, Preamble will
be appended before the data transmitted.
Postamble transmission: By setting Enable, Postamble will
be appended after the data is transmitted.
Example:
Add a prefix/suffix or preamble/postamble for all symbologies.
In this example, you are sending a $ symbol as a prefix for all
symbologies.
Steps:
1) Scan Programming and Prefix characters setting barcode.
2) Use the ASCII code table to find the value of $
→24.
3) Scan 2 and 4 from the barcode on the fold out back page.
4) Scan Finish from the barcode on the fold out page.
5) Scan Exit barcode.