Greetings from Mexico
I’m currently developing an application that connects the Fastrack with a device in order to get and set information from and to it. The way I use the fastrack is connecting the serial port with the device for information exchange. (I only use 3 pins -read RXD, write TDX, ground GND), and the db15 cable (converted to db9) to a laptop in order to read the commands in the ‘HyperTerminal’ software.
When I use the DB15 cable plugged to a laptop, the GPIO pin reads values of 1 and 0 (5 volts and 0 volts) correctly, the GPIO-Input pin being the #25.
The problem comes when I disconnect the DB15 cable and let the device work unmonitored, when I do that, the GPIO-In pin always reads 1, always, no matter if I put 5V or 0V.
Seems to me that this is an electronic problem, but I have no idea why or how to solve it.
Any help would be appreciated, this is the only detail keeping me from doing pilot tests.
Thanks in advance.