Shop OBEX P1 Docs P2 Docs Learn Events
USB2SER to BS2 et al — Parallax Forums

USB2SER to BS2 et al

Mark@TecMark@Tec Posts: 2
edited 2011-03-03 11:18 in BASIC Stamp
I have been having trouble getting the Parallax USB2SER adapter to work with a Stamp. The problem is that I want to use a BS2P40, which does not fit on a Board of Education. So I have it on a breadboard. The adapter has 4 lines out (Vss, Tx, Rx, RES). It's actuallly the Propeller plug. I was informed that it can be used with the BS2 series. Does anyone have a schematic of a solution? It would be most helpful. Thank you

Comments

  • Mike GreenMike Green Posts: 23,101
    edited 2011-03-03 11:18
    You can use the USB2SER for data (connected to I/O pins on the Stamp), but you can't use it for programming unless you add external parts because the USB2SER provides normal serial signals at +5V (start bit high) while the Stamps expect inverted serial signals at RS232 levels (start bit low or negative). Use the USB BOE schematic and the USB2SER schematic (on the datasheet) for reference to see what's added. You need a transistor and its associated resistors in the RST, TX and RX lines.
Sign In or Register to comment.