Nokia 9000 - 2 Application; The Serial Port Connection; The User Interface

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Copyright. 1999. Nokia Mobile Phones. All right reserved
2. APPLICATION
There are three main parts in the application:
• The serial port connection
• The User Interface
• The SMS sending support.
This application has been successfully used with a GPS receiver which has Trimble's ACE II 8-
channel GPS receiver board and Aztec's OEM4000 RDS board. It uses Trimble's miniature OEM
Antenna. However this application can also be used without the RDS board. This application
supports the NMEA 0183 protocol and GGA and VTG frames.
2.1 The Serial Port Connection
The application receives defined location frames from a GPS device using serial cable. The frame
structure is explained later on in this document (Section 3). There is no need to edit frames in the
communicator. The line feed (\n) between the GGA frame and the VTG frame is erased by the
application. Only Ground and RxD pins are needed on the communicator end. The GPS device
uses only Ground and TxD pins to send the frames. The easiest way is to use the communicator's
normal PC-cable (DLR-1 or DLR-2) and pin-converter, if needed.
One example of a pin-converter is shown in Figure 1.
Figure 1. Example of a Pin-Converter.
2.2 The User Interface.
There are four selectable functions on the main UI (Figure 2):
1. The Start button starts sending position information according to the settings.
2. The Reset button clears the current position information.
3. The Settings button opens the settings screen.
4. The Quit button exits from the software.
More exact UI Figures are specified later on in this section.
Communicator
PC-cable
(female)
Converter
(male)
Pin 5 GND
Pin 2 RxD
Pin 3 TxD
Converter
(female)
Pin 5 GND
Pin 9 RxD (RDS)
Pin 7 TxD (NMEA)
GPS receiver
(male)