Hi all,

Here again with aquestion about how to read 2 devices with a single RS232
Port on my laptop.
The idea is to read data from a GPS unit (DB-9 "A" connector) and keep
conected a TNC unit (DB-9 "B" connector) via the RS232 COM port of my laptop
(DB-9 "C" connector).
I4m not sure if a couple of CD4066 Quad bilateral switch ( one for the "A"
and one for the "B" connectors ) will be enough in speed to switch the
incoming and outgoing data across the COM port.
Using a PIC16F84A-20 I can sense the DCD from the GPS "A" connector and
enable the the CD4066 to switch on the communication between the PC and the
GPS, then keep off both CD4066 when no DCD is detected, same procedure with
the DCD from the COM port when the outgoing signals must flow to the TNC and
no to the GPS.

Any idea or suggestions are wellcome.

Regards,

Augusto, OA4CVT


******                                       ******
* GPS*                                       *TNC*
******                                       ******
      *                                                *
      *                                                *
      *         **********                   *
      ****** SWITCH ************
                 *    BOX    *
                 **********
                          *
                          *
                          *
                   *********
                   * COM    *
                   * PORT   *
                   *********

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