OpenEVSE supports many Serial TTL Devices at 5v on the 6 pin header.
The header is the common FTDI format.
Pin 1 - Ground (Black)
Pin 2 - No Connection
Pin 3 - 5v (Red) - 75ma max Higher power devices must use external power.
Pin 4 - Recieve (Yellow) connects to transmit on the remote device.
Pin 5 - Transmit (Green) connects to receive on the remote device.
It is recommended to update the latest version of firmware. Many changes have been made over time. This guide was written with Firmware version 3.7.8.
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