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Description
The Pin allocation for the M12 power and communications are as shown below.
| Pin | Wire Colour | RS422 | RS485 | SDI-12 |
| 1 | White | Voltage Supply (V-) | ||
| 2 | Brown | Rx- | – | |
| 3 | Green | Rx+ | – | |
| 4 | Yellow | Tx- | Data – | – |
| 5 | Grey | Tx+ | Data + | – |
| 6 | Pink | Voltage Supply (V+) | ||
| 7 | Blue | Signal Ground | ||
| 8 | Red | – | – | SDI-12 Signal |
Any cables that are not used, should be isolated and grounded at the terminating equipment. The signal ground should be used in conjunction with the RS422 Tx/Rx lines in order to improve noise immunity