Symbol SE 923, Integration Manual

Page: 17 / 238

1-1
Chapter 1
Getting Started
Overview
The SE-923-I000A is a miniaturized, high performance 650 nm laser-based, single-line
decoded scan engine intended for integration into customer device.
Theory of Operation
The SE-923 contains:
•
a miniature laser scan engine and decoder
•
a watch dog timer
•
a low current beeper line
•
a decode LED output line
•
two serial I/O lines
•
two hardware handshaking lines
•
trigger and wake up lines
•
non-volatile memory for storing decoder capability parameters.
The SE-923 has a low power mode that maintains the internal RAM contents but freezes its
system oscillator, placing the unit into a dormant state.
After power up initialization, the SE-923 begins in low power mode. Pulling the TRIG* line
low starts a scan and decode session. If a valid bar code is scanned, the micro-controller
decodes it and sends the results to the host via the TXD line.