ER-301/Teletype Connection

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Connecting the Teletype to the ER-301

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If your ER-301 board revision is revision 7 then you will need to follow different instructions which you can find here.


Please note: The ER-301 does not ship with i2c cables. Here is some info on how to DIY your own cables: DIY i2c cables @ LINES forum.

In a nutshell, i2c requires 2 communication lines (SCL and SDA) plus 1 ground line. So there are 3 pins on the Teletype that need to be connected with a custom cable to 3 pins on the ER-301. Along the bottom edge of the ER-301, you will find an I2C header with 3 pins labeled as GND, SCL, and SDA. Please connect those pins to the same pins on the Teletype as follows:

  • Teletype GND to ER-301 GND.
  • Teletype SCL to ER-301 SCL.
  • Teletype SDA to ER-301 SDA.

Note that the connections are all one-to-one with no crossovers.

Teleteype-Connections-Rev10.jpg