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alternative serial port connection — Parallax Forums

alternative serial port connection

William50William50 Posts: 22
edited 2008-04-28 05:44 in Propeller 1
I will be using a MAX3235 in place of the discrete circuit show in Figure 2.3.2 on page 5 of the Prop Datasheet.

I see that the DTR line (pin 4 of the DB9) to the prop's RESn line has a pull-up resistor in it.

Will the pull-up resistor and the 0.1uF cap still be required with the MAX3235 chip?

Comments

  • Mike GreenMike Green Posts: 23,101
    edited 2008-04-28 05:44
    Consider the circuit for the Propeller Demo Board which uses an FTDI USB to serial interface chip that provides a similar serial interface as many RS232 interfaces like the MAX3235. You will need 1K protective resistors in the RX lines from the MAX3235 since it's a 5V chip and the RX line from the MAX3235 goes between 5V and 0V.
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