Pinout for Oudie serial cable with RJ45 connector:
1 & 2 = +12V
3 & 4 = no function
5 = Receive data to Oudie = Rx
6 = Transmit data from Oudie = Tx
7 & 8 = Ground

Pinout for Oudie serial cable with RJ45 connector:
1 & 2 = +12V
3 & 4 = no function
5 = Receive data to Oudie = Rx
6 = Transmit data from Oudie = Tx
7 & 8 = Ground