====== J4 ======

^  J4  ^  Main Serial Connector  ^
|  1  |  Ground  |
|  2  |  VCC (5V)  |
|  3  |  Transmit Data (TXD)  |
|  4  |  Receive Data (RXD)  |
|  5  |  Data Terminal Ready (DTR) - Not Connected  |
|  6  |  3V3 - Not Connected  |

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