Pin | Signal | Description |
1 | Gnd | |
2 | USB D+ | connected with PC USB D+ (pin 3) in USB data cable |
3 | USB D- | connected with PC USB D- (pin 2) in USB data cable |
4 | USB Vbus | connected with PC USB Vbus (pin 1) in USB data cable |
7 | Rx | at least for VS2, VS3 |
9 | Tx | at least for VS2, VS3 |
+9v additional power needed in COM (not USB) cable