
UCH provides a capability to transport ANALOG data across digital network. If there are analog
data (for example, ATM machines, credit card terminal, utility meters, or computer with analog
modem) need to be able to interface with digital data network, UCH can provide the ideal
interface connectivity.
UCH provides the telephony interface (dialtone, loop current) and modulation/demodulation to
extract the information content from the interface and then package the data over digital network
pipe to a server with interconnectivity with PSTN to deliver the information to the end points.
2.3 GPS
With the popularity of GPS, GPS receivers can be bought on the market fairly inexpensively. The
Universal Communication Hub can interface to a NMEA based GPS receiver (for example:
http://www.rayming.com/products/tripnav_tn200.htm), either the USB based or Compactflash
based, process the information, and communicate that information to configured destination. This
allows maritime/trucking fleet companies to manage their assets and monitor the position of each
vessels/vehicles.
The main configuration related to this application is in the APPLICATION/GPS block. There are
six relevant parameters:
•Proxy: this is the destination that the GPS position information will be sent to (email
address)
•Type: SMS or Buffer (SMS needs to be capable of handling about 90 characters)
•Interval: This is the interval that the data is being sent (either SMS or buffer)
•Buffering: Type of data to store. The unihub can filter out bad data, invalid signal data,
etc.
•Expiration: If the data cannot be sent within this amount of time, it is discarded because it
is stale.
•Limit: In polling mode, this parameter dictates how much GPS data to store.
Another parameter that is important is the SMSC address in the UPSTREAM/SERIAL
configuration. For iridium, this is *2. This is used for SMS type of GPS data reporting.
Also, while the GPS receiver is plugged in to the Universal Communication Hub, you can view the
data by pressing USB (7) or CFCARD (4) action key, and select ShowGPS. There is another
command SendGPS which manually trigger the Universal Communication Hub to send latest
GPS data to the network.
The format of the GPS information includes:
Unihub rcv_time,
offset from last unihub gps data time,
unihub gps message counter,
current year based on GPS receiver message
current month based on GPS receiver message
current day based on GPS receiver message
current hours based on GPS receiver message
current minutes based on GPS receiver message
current seconds based on GPS receiver message
current latitude based on GPS receiver message
current longitude based on GPS receiver message
current altitude based on GPS receiver message
current speed based on GPS receiver message