Motorola Symbol PL4507, Integration Manual

Page: 202 / 424

9 - 34 Symbol PL4507 Decoder Integration Guide
Code 39 Buffering (Scan & Store)
Parameter # 71h
This feature allows the decoder 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 decoder 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 9-35 ) 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 decoder issues a lo/hi beep to indicate successful
decode and buffering. (For overflow conditions, see
Overfilling Transmission Buffer .)
•
The decoder 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)