The board has a field of 9 jumpers designated "ID" and labelled 1-9. Number 9 is reserved for production testing, leaving 8 for addressing. Eight jumpers give 256 possible bus addresses, out of which addresses 250 to 255 are invalid. The bus address is the numeric address used by Xwire to select the board. Every board connected to an Xwire system (be it using the Xwire connections or RS485), must have a unique address. The jumpers are in a binary format meaning each jumper has a unique value. Any address value from 0 to 255 is possible by adding links to the jumper connector. Every link added adds that jumpers value to the final total.
| Jumper | Value |
|---|---|
| JP1 | 1 |
| JP2 | 2 |
| JP3 | 4 |
| JP4 | 8 |
| JP5 | 16 |
| JP6 | 32 |
| JP7 | 64 |
| JP8 | 128 |
| JP9 | Reserved for production testing. |
Example: If there are 3 jumper links installed, namely JP1, JP5 and JP6 the Xwire slave address would be 1 + 16 + 32 = 49.