Welch Allyn Scanteam 3700PDF, Technical Manual

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Programming the Scanner 4–3
4.3 Scanner Signals and What They Mean
The SCANTEAM 3700PDF Reader provides various types of audio feedback to the
operator to enhance ease of use and productivity. The unit emits single, double, and
triple beeps and also emits a ticking sound and a hum. Each of these sounds indicates a
different condition. Additional information about the audio feedback is provided later in
this chapter.
4.3.1 Audio Feedback and PDF417 Decoding
Using the SCANTEAM 3700PDF Reader, there are three distinct “phases” to a
successful PDF417 decode:
•
Data Collection
•
Decoding
•
Good Read/Data Transmission
The SCANTEAM 3700/PDF unit provides distinct audio feedback for each of these
phases, as follows:
Data Collection Constant “ticking” as the operator moves the reader across the PDF417
code and acquires PDF417 codewords for decoding
Decoding Once the reader has acquired enough data for decoding, the unit stops all
collection (ticking stops) and produces a steady tone (a “hum”) to indicate the reader is
decoding the collected data.
Note: The time a SCANTEAM 3700PDF unit spends decoding (“humming”) is dependent on the
size of the PDF symbol and the error correction level used when the symbol was printed.
The more data encoded in a PDF symbol, the longer the time to decode.
Good Read Once the SCANTEAM 3700PDF Reader has completed a successful
decode, the unit produces a single beep and transmits the decoded information to the host
device.