Hardware reference guide

7535 Hardware Reference Guide 9
Chapter 2: The Hardware
The Scanner
2.3 The Scanner
The 7535 can support the following scanners, internal or external:
• 1D scanner
• PDF 417 2D scanner
• image scanner
Only one scanner is installed in the 7535, but a second handheld scanner can be con-
nected via the tether port.
Internal scanners can be triggered from the trigger switch on the 7535’s handgrip (if
present) or from the Scan button on the 7535’s keyboard. External scanners can only
be triggered from their own trigger switch.
2.3.1 Scanner Control Services
This top level service (SCS) is responsible for supporting a variety of Physical Scan
Drivers (PSD), and presenting an API to applications. It receives decoded scan data
from the drivers, performs any configured translations, and delivers the data to the
appropriate application(s).
2.3.2 Non-decoded Laser Scanners
These scanners present raw data to the terminal. Internal and external non-decoded
laser scanners are controlled by the main processor. Activation of the scanner trig-
ger(s) or the keyboard scan button(s) causes the main processor to initiate a scan
with the appropriate scanner. The peripheral controller acquires the raw scanner data
and feeds it to the main processor.
The non-decoded scan driver is responsible for receiving this data from the periph-
eral controller and decoding it before passing it to the Scan Control Service, which
performs any configured translations and delivers the data to the appropriate appli-
cation(s).
2.3.3 Decoded Laser Scanners
These scanners process their raw data themselves, presenting formatted data to the
terminal. Both 1D and 2D decoded laser scanners are supported by the 7535. The
scanners will be connected to one of the serial ports and controlled by the main pro-