Pin Signal Name Function Direction
1 USB_D+ USB data line In or out
2 USB_D− USB data line In or out
3 GND Signal ground -
4 RxD RS232, receive data In
5 TxD RS232, transmit data Out
6 NC Not connected -
7 PWR Power input, 10.5 V–28 V In
8 AUX_ON RS232, manual PWR switch In
Ports at the instru-
men
t underside
Pin assignments for
8 pin LEM
O-1
Pin Assignments and Sockets 59