5056D and the RS232 port?

[Fastest1]

Can this port be used for control of the driver just as the adjacent connections? I see it has a 6 pin RJ11? or similar. I am trying to connect it to a C35 board that uses RJ45 network cabling. I see that Cnc4PC has an adapter or breakout board that goes from an RJ45 to screw terminals or pins (there a few variations) for a Keling drive. Couldnt I just build a network cable compatible with each port? I do realize a pair is not being used. Pinout of that port possibly(the 5056D)?

[Fastest1]

The 6 pin connector of the 5056D marked "RS232" can NOT be used as a control link to an RJ45 port of a breakout board. This is for software tuning of the driver only, the way I understand it anyway.