Trane CGAH 235 Chiller communication port

[judasfan]

Hi to everybody, I was wondering if you could help me locate this chiller's communications port? Here is a picture of SMM module and this RJ11 connector beside it. Thank you in advance!

[Lowrider]

That's the modem port.

The yellow and white wire below the flatcable are on the comm port.

[judasfan]

That's the modem port.

The yellow and white wire below the flatcable are on the comm port.
Thank you very much, could you be so kind to tell me more about it? Only two wires for communication?!

[Lowrider]

This comm port uses a protocol that only we, Trane, can read. How ever should you want to we can install a BCU and than you can communicate with the BCU over BACnet/IP, which in turn communicates with the chiller(s).