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Extension modules • RS232 module •

With this module you can connect the UART interface of the microcontroller to a RS232 (V.24) interface and in this way you can i.e. realize the data transfer between a PC and a microcontroller through the serial interface.

To get into this area easier exaple programs for the microcontroller as well as the PC are available. In this example a text gets transfered from the microcontroller to the PC. The PC will then display the text. With the example program you can transfer data from the PC to the microcontroller. The microcontroller will give these data out on a port.

The PC programm has been written in Visual Basic. The sourcecode as well as a compiled version is available.

Data

Suitable for Experimenting Board

I and II
Attachable to extension port

Port 0, 1 and 3
Einstellungen am DIP-Schalter

No special adjustments necessary. XTAL 1 and XTAL 2 should be "ON" so the MC gets a tact signal.
Power consumption

~ 15 mA
Circuit board / Layout
Limitations

None. Please note that the opening at the side of the connector is on this module not pointed to the edge of the board. This makes a better running of lines possible...
Developed by

Jan Cordes

Schematic

Click on the schematic to open it in full size.

Schematic and Layout

For the schematic and layout plans you need the highly recommended schematic and layout editor EAGLE. A free english version can be downloaded at http://www.cadsoft.de/freeware.htm.

RS232 module Schematic and layout
File size: around 10 KByte