G4ZLP Digimaster Pro 3 and CAT control

[M0CLH]

I have been trying to get this interface to work with little success. Having unlocked it with an ancient Windoze laptop, I can see the Audio Codec and the three psuedo serial ports on my Macbook Pro running El Capitan. Whatever combination of CAT options I use for my KX3/PX3 rig, I get the occasional flashing red light but no communication. Has anybody had any luck with this interface? Using Fldigi confirms that the audio side seems fine but again, no success with direct CAT control. Any suggestions please?
Terry, M0CLH

[M0CLH]

Success!! The interface was supplied with a 5v TTL module (CM1) - the KX3/PX3 requires true RS232 ±12v signaling. Neil, G4ZLP then sent a CM3 module to install. Together with a tip-to-tip and ring-to-ring CAT cable, It all started working fine! It does seem to be a cleaner sound interface than the SignaLink that has been used to date.
I hope this information is useful to others who contemplate using the Digimaster Pro 3.
Terry, M0CLH