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8 pins connector
HP A799 POS receipt printer cable. Uses 24V Poweredusb connector. Other end is a proprietary? connector with locking mechanism. Pins counted from left to right with blank side of connector down.

 

Device 1
Pin Number		 Device 1
Pin Name		 Direction Device 2
Pin Number		 Device 2
Pin Name		 Description
1   GND   5   GND    Ground (power)
2   POWER+   6   POWER+   24V
3   GND   4   GND   USB Ground
4   DATA-   3   DATA-   USB Data -
5   DATA+   2   DATA+   USB Data+
6   USB VCC   1   VCC   USB Vcc
7   POWER+   7   POWER+   24V
8   GND   8   GND  Ground (power)

 

8 pin Powered USB connector layout
8 pin Powered USB connector
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