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RS-232 Serial Interface Option

A project log for MMBASIC on Small RP2040 Card

Card set running BASIC Interpreter for the Raspberry Pi Pico on Seeed Studio XIAO RP2040

land-boards.comland-boards.com 08/19/2022 at 13:010 Comments

Adding an optional RS-232 interface.

Using DTE card.

Wired to D6, D7, +3.3V, Ground on QTPy49-01 or QTPy49 card.

Pinout for J4 on QTPy49 cards:

  1. GND
  2. 3.3V
  3. TX, D6
  4. RX, D7

Tx on QTPy cards to Rx on DTE card.

Loopback on RTS/CTS lines on the DTE card satisfies hardware Handshakes.

Setup in MMBASIC

OPTION SERIAL CONSOLE GP1, GP0

Runs at 115,200 baud. 

Stackup

Using 4-40 standoffs for stackup.

With DB-9 Breakout and FTDI-49MM plus DCE cards.

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