Pricom made a very nice DCC protocol analyzer with an LCD screen.


Apparently no longer sold because of lack of the LCD screen.

You can update the firmware yourself, using a special cable:

Wiring for firmware update cable.

description RJ11 DB9 color
NC 1    
ground 2 5 yellow
xmit > pc 3 2 brown
rcv < pc 4 3 red
ground 5 5 yellow
NC 6    


current and last firmware version: v1.52

Download page for the Pricom tester

If you find one, buy it.


NCE also makes a packet tester, see the NCE page.