All instruments showing dashes

[dougg]

I have a network of i70 instrument heads that show speed, depth, wind, AIS, etc. They have been working for a number of years and suddenly started showing dashes. All instrument heads are on/powered but no data is being shown from any of the transducers or sources. So not a power issue as the displays are lit up, which should mean that this isn't a problem with a cable coming loose. Seems to be a Seatalk issue. I also checked the 5-way connector and it is showing a green light so network seems powered up. Chart plotter still working fine, though not getting any data like depth or wind from the network either.

Wondering what might cause this. Could it be a terminator fell off? Something else? Happened suddenly while sailing so no other system changes took place to trigger it.

Thanks in advance.