MultiSerial Shield

The Strich Labs MultiSerial shield adds two extra RS232-type serial ports to the Arduino platform. It uses the I2C ("Wire") bus on the Arduino, leaving all digital pins free for your own use (except one, if interrupt support is used). Porting code from the Arduino Serial library to the MultiSerial Shield library is easy, normally requiring only one or two small changes to code already written. The shield uses a true I2C UART, which means reliable communication at up to 230.4kbps is possible on each channel, with minimal overhead on the Arduino’s processor. The shield also provides 8 3.3v GPIO pins, each with configurable interrupt-on-change support.

Documentation and resources for the MultiSerial Shield can be found at the MultiSerial Shield product information page.