Rice Lake Motorola DS457 Laser Scanner - Manual (Page 259)

Symbologies 12 - 37
Code 39 Buffering (Scan & Store)
Parameter # 71h
This feature allows the imager 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 imager 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 128 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 12-38
) 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 imager issues a lo/hi beep to indicate successful
decode and buffering. (For overflow conditions, see
Overfilling Transmission Buffer
.)
• The imager 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)