HP Point of Sale rp5000 HP USB Barcode Scanner Programming Reference Guide - Page 44

Symbologies 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" in this chapter) 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 scanner issues a lo/hi beep to indicate successful decode and buffering. (For overflow conditions, see "Overfilling Transmission Buffer" in this chapter.) ■ The scanner adds the decoded data excluding the leading space to the transmission buffer. ■ No transmission occurs. Clear Transmission Buffer To clear the transmission buffer, scan the Clear Buffer bar code below, which contains only a start character, a dash (minus), and a stop character. ■ The scanner issues a short hi/lo/hi beep. ■ The scanner erases the transmission buffer. ■ No transmission occurs. 2-36 Clear Buffer Programming Reference Guide