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

Rich,

For what I have done in a similar situation, you could utilize the CTS & RTS signal lines between the PC and the SX chip.  Using these signal lines helps the SX to control when the RS232 buffer from the PC will be sent to the SX.  When the PC wishes to transmit data to the SX, the RTS line from the PC notifies the SX that data is waiting to be sent.  When the SX modifies the signal on the PC's CTS line, then the RS232 buffer will send data to the SX.

Gary

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