Curtis 1309 RJ11 pin out

Hello,
I'm using a curtis 1236 controller with the 1314 PC-Software and the 1309 canbus device to configure the settings. I made the wiring new and installed an outdoor USB socket to connect the BMS and controller software from the PC with the bike. Unfortunately i cut off the old connector at the rj11 sprial cable without writing down the color codes.
Does anyone know the connection of Ground, 12Volt, RX and TX with the colors black, red, green and yellow of the RJ11 cable.

Thanks Martin

Hello, i figured the color code out.
Yellow RX, Green 12V, Red TX, Black Ground.

Nevertheless i don't get the communication working. I'm afraid that the 1309 unit is not working properly. It is strange that the power LED is never on. Is the LED on when the 1309 serial connection cable converter is connected to the controller. My controller delivers about 10.4Volt.

Thanks