Existing a development version with 4 pins are respectively VCC GND RXD TXD VCC voltage 3 v, so the four mouth formal TTL level signal output,
Usual monitoring development version print information using secureCRT round of 232 + 232 + USB TTL development board to print information, many occasions is not convenient,
Now want to get a small plate (may contain a chip, an insert memory card base) inserted into the development version of the four mouth, development version to print information directly, and into the sd card,
Consult the feasibility? If you can use that kind of chip? Or what details descriptive technology?
Thank you very much!!!!!!