It's been a while since I've had to deal with this, as I've changed companies over a year ago, but one of my old customers contacted me and is having an issue with a V570-57-T20B that is plugged into an EX-A2X adapter. The adapter has a DI16 and RO8 attached. He is getting a blinking COM light, and obviously because of that nothing is working. These components are all installed on a fuel tanker truck, and they control the fuel delivery systems, so obviously this is a bit of an issue. He's replaced the EX-A2X, same result. Could this be a cable problem, or a problem with the DI16 (it is first in line after the EX)? Installation is a good 1k miles away from me, so it's not like I can just go look at it...