FingerVein Online
Installation and Programming Manual
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24 of 69
Default value:
- 0xFF: Events are not generated until the Host has started communicating.
Note that a spontaneous TCP/IP output cannot be defined.
8.1.3. Optical barrier configuration
Byte
$02
:
Optical Guard Time
. This configures the optical barrier guard time: when
the optical barrier has detected the presence of the finger, it is disabled for a few
seconds. This allows for biometric identification, with no new finger detection events
occurring. If the guard time runs out and the finger is still blocking the optical
barrier, a new event will be generated.
Permitted values:
- 0x00 .. 0xFE: Guard time value in tenths of a second.
Default value:
- 0x14: Guard time of 2 seconds.
Byte
$03
:
Optical Watchdog Timer
. In its standby state, the optical barrier detects
the beam of light from the LED transmitter. If it does not detect the beam for some
time, it may be due to a mechanical or electronic fault. In this situation, you must
press the green key (“Enter”) to initiate biometric identification. When the Watchdog
Timer of the optical barrier is triggered, the Host receives a notification (
event, code 0xED ). It will automatically return to normal when the
beam of light is no longer obstructed (
default value of the Watchdog Timer allows for 2 or 3 consecutive identification
attempts to be made without removing your finger from the biometric sensor.
Table 6: Optical barrier configuration
No.
Description
Def.
$02
CFG-UI_OPT
_T_GUARD
Time-out between finger detection events
$14
$03
CFG-UI_OPT
_T_WDOG
Watchdog for permanent blockage detection
$80
$05
CFG-UI_OPT
_KeyCode
The optical barrier will generate a
event corresponding to a configurable key value
$41
