^  COM1_SEL               |||      ^  COM2_SEL                    ||||      ^  EDP             |||      ^  VDD_JU1      ||       |
|  1         |  3  | RS232  | :::  | 1          | 3  | RS232        || :::  | 1     | 3  | EDP   | :::  | 1         | 2  | 3.3V  |
|  2         |  4  | :::    | :::  | 2          | 4  | :::          | :::  | :::  | 2     | 4  | :::   | :::  | 3         | 4  | 5V    |
|  3         |  5  | RS485  | :::  | 3          | 5  | RS485        || :::  | 3     | 5  | LVDS  | :::  | 5         | 6  | 12V   |
|  4         |  6  | :::    | :::  | 4          | 6  | :::          | :::  | :::  | 4     | 6  | :::   | :::  |           |    |       |