Symbol Technologies DS 3408 - Manual (Page 185)

Symbologies 13-27
Code 39 Buffering (Scan & Store)
Parameter # 71h
This feature allows the digital scanner to accumulate data from multiple Code 39 symbols.
Selecting the Scan and Store option (Buffer Code 39) temporarily buffers all Code 39 symbols having a leading space as a first
character for later transmission. The leading space is not buffered.
Decode of a valid Code 39 symbol with no leading space causes transmission in sequence of all buffered data in a first-in first-out
format, plus transmission of the “triggering” symbol. See the following pages for further details.
When the Do Not Buffer Code 39 option is selected, all decoded Code 39 symbols are transmitted immediately without being
stored in the buffer.
This feature affects Code 39 only. If selecting Buffer Code 39, we recommend configuring the digital scanner to decode Code 39
symbology only.
While there is data in the transmission buffer, selecting Do Not Buffer Code 39 is not allowed. The buffer holds 200 bytes of
information.
To disable Code 39 buffering when there is data in the transmission buffer, first force the buffer transmission (see Transmit Buffer on
page 13-28 ) or clear the buffer.
Buffer Data
To buffer data, Code 39 buffering must be enabled and a Code 39 symbol must be read with a space immediately following the start
pattern.
• Unless the data overflows the transmission buffer, the digital scanner issues a lo/hi beep to indicate successful decode and
buffering. (For overflow conditions, see
Overfilling Transmission Buffer .)
• The digital scanner adds the decoded data excluding the leading space to the transmission buffer.
• No transmission occurs.
Buffer Code 39 (Enable)
(01h)
*
Do Not Buffer Code 39 (Disable)
(00h)