In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Zoot wrote:

Should be instantaneous. Not sure what LED program you mention.

Do you have a pullup (4.7k or so) on your serial pin (open true)? Not sure it would matter with your PC serial board.

Tying RTCC to Vdd is fine.


Have you tried a simple experiment just to see if the SX(es) are transmitting/receiving properly without hiccups? That way you could at least narrow down if it's the SX and it's related code/circuitry or something with your PC rx/tx board and the PC. I would set up one SX as a TX and one as an RX -- send a serial byte from one to the other (TTL serial, no driver needed). Have the RXing SX do something like:

IF rxByte = %01010101 THEN
   Led = 1
ELSE
   Led = 0
ENDIF

And have the TXing SX send that same byte every few seconds, then send 0 every few seconds. Basically have the TXing SX turn the led on and off on the RXing SX. If that works, then you can be confident that your RX/TX and SX setup is OK, and the question will be getting it to work properly to your PC through the driver (or vice versa :-))...

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