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What is included In
HS GPSDLL:
HS GPSDLL (Standard edition):
HsGpsDll.dll - Windows DLL (Dynamic Link Library) for use from programs
in Visual C, Visual Basic or other languages
HsGpsDll.hlp - Windows
documentation file (this file)
HsGpsDemoVB6 - Visual Basic
test application with source code using HsGpsDll.dll
HsGpsDemoVC - Visual C
test application with source code using HsGpsDll.dll
HS GPSDLL (Blueprint edition):
Includes
everything in Standard edition plus FULL SOURCE CODE in Visual C (plain
C style), including core GPS NMEA message processing engine.
Features
Interfaces
a GPS receiver over COM ports COM1 - COMn (any port
number can be used)
To
obtain GPS information, HsGpsDll decodes the
following sentences of NMEA-183 (National Marine Electronics Association,
Interface Standard 0183:
- $GPGGA - geographical position fix data
- $GPRMC - Recommended
minimum specific GPS data
- $GPVTG - velocity over ground
Supported EQUIPMENT
Supports
any NMEA-183 Compliant GPS device with serial RS232 interface
Applications
Navigation
Security
Telematics
Fleet
Tracking
Asset
Tracking
Any
customer applications requiring access to a NMEA-183 compliant GPS receiver
customization
Hillstone Software provides additional
services for customization, porting and integration of the library code
to better suit the needs of your products
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overview
 HsGpsDll
is a Windows Dynamic Link Library which provides access to any NMEA-183
compliant GPS receiver via a serial communications port.
HsGpsDll is designed for use from Visual C, Visual Basic or other
programming languages, capable of calling DLL functions.
HsGpsDll allows a user application to easily read from a GPS device the
current GPS position fix and current velocity over ground (speed in
kilometers per hour)
GPS position fix obtained via HsGpsDll contains:
Latitude coordinate in degrees, minutes, seconds and direction
(South / North)
Longitude coordinate in degrees, minutes, seconds and direction
(East / West)
Coordinates in
decimal degree format
Fix quality - valid or invalid
Number of satellites in view
Speed in kilometers per hour
Altitude (Mean Sea Level)
UTC date and time
 The
demo application shows current GPS location on a map provided over
internet connection (if available) from
Google Maps map server. The map zoom level is adjustable from 16 to
0. The map is updated every 10 seconds if the coordinates of GPS
receiver change.
The HsGpsDll library allow a user to configure the settings of the
serial communication port to which GPS receiver is connected (COM port
number, selectable from COM1 to COM32, speed, data size, number of stop
and data bits, parity)
how it works
HS GPSDLL
continuously reads asynchronous data stream from a serial port and
analyses the information to recognize and decode NMEA-183 Protocol
sentences. After each message is received it is checked for integrity by
comparing the received and the calculated checksum. The NMEA sentence
fields are then converted from ASCII values into C structure variables
and ready to be retrieved with an API call.
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