CHAPTER THREE - PL3000 BASICS
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NID Key Backlight
If you need either to enable or to disable the keypad’s backlight property, a
NID Key Backlight applet makes it possible.
NID Keypad
A NID keypad is an applet to control all the following properties the keypad
has:
•
Changing a key to another one
•
Enabling/disabling the scan key
•
Default mode of the alphanumeric keypad, being numeric, lower-case
text-writing, or upper-case text-writing
•
Changing the functioning of the mode selectors of the alphanumeric
keypad
NID Link Watchdog
With a NID Link Watchdog applet you can bring a connectivity monitoring
service into use, either wireless LAN (WLAN) or USB. The service informs user of
the loss of connection by sounding a warning signal and showing the message you
can see appropriate for the situation on the screen. When there is functional
communication channel available again, the message window disappears from the
screen with a connected-sound.
The purpose of this service is to increase usability of the device especially in
the WLAN environment in which the loss of connectivity may happen on a daily
basis because the device goes out of range of the WLAN coverage, or bad quality
of signal transmission path persists for long enough. So the user can receive
information about the loss of WLAN connectivity, which may be otherwise difficult
to notice among other hitches such as slow response time, and accordingly it is
possible take right action when the loss of WLAN connectivity arises.
The link watchdog service calls for the computer being reachable through the
wired backbone network of the WLAN infrastructure. Monitoring does not require
any special software on that computer, just its IP-address and a TCP port number
to send ‘polls’ are set in the applet. However, the polling requires that the TCP port
is open in the computer. Additionally the machine must respond to TCP connection
initiations from the PL3000. One alternative to the endpoint to monitor connectivity
is the computer running a web server.
Note!
If there is a firewall, a NAT, or both of them in operation between
the PL3000 and the computer to which the polls are sent, it might be that
the NID link watchdog service is not workable in that case without
configuration changes to the NAT and the firewall.
