As far as I can remember, I've read somewhere that there are certain types of external TMC receivers compatible with this model. I mean exactly with this model. Back then I wasn't interested on buying one, but now I am. So here I am asking about it. And it worked via USB port. TMC receiver was connected to USB, DC was connected to TMC receiver's USB and antenna to receiver's jack. As for port and baud, I don't remember exactly if it had to be set manually or was done automatically by device.