Friday, 13 July 2012

     Today I learned how to built RS232 data interface cable by using wire communication of black (pin 5), yellow (pin 2) and white (pin 3). Only connection for pin 2, 3 and 5 do for this task, the connection refer in figure below:  

Sub-D 9 pin

                    Sub-D 9  pin diagram                                            Sub-D 9 pin table

    This cable will connect to PIC board where 5V logic level receive and transmit signals of the PIC are connected to RS232 levels by a MAX232 device. Baud rates are generates by dividing down the system clock. The USART ( Universal Synchronous Asynchronous Receiver Transmitter) receive and transmit pins are C7 and C6 respectively.

Concept of receive and transmit

Tools required: wire communication (black, white, yellow), solder iron, solder lead, wire crimper, wire stripper, sub-D 9 pin male, pin header connector, shrink tube.

 

Wire stripper                                     Wire crimper

RS232 data interface cable

After that, do some research and any information about programming for new task which to set the PIC to send SMS in each 10 minutes. In 10 minute concept already but to set the programming for GSM modem still have problem.