The above is from USB2SER data sheet, and it seems you should use TRUE STATE. Tray to change to:The USB2SER is not able to program BASIC Stamp® microcontroller modules. BASIC Stamp modules
require an inverted signal. If you need to program a BASIC Stamp use the FTDI USB to Serial Adapter
serin GPIO.1, 2, val
and
serout GPIO.2, 2, [val]
(see PBP manual pag 130)
Al.




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