| PC USB Pin | SIEMENS Pin | Description | 
| 1 | 1 | USB Vbus | 
| 2 | 4 | USB D- | 
| 3 | 3 | USB D+ | 
| 4 | 2,5,6,7 | GND | 
Pins 2,5,6,7 of Siemens connector are wired together. USB VBus may be not connected - should work without this connection.
 
| PC USB Pin | SIEMENS Pin | Description | 
| 1 | 1 | USB Vbus | 
| 2 | 4 | USB D- | 
| 3 | 3 | USB D+ | 
| 4 | 2,5,6,7 | GND | 
Pins 2,5,6,7 of Siemens connector are wired together. USB VBus may be not connected - should work without this connection.

