Addressable Protocols

[lilrags16]

@NewAgeServer

MAPNET was replaced by MAPNET II in the 90s and then that was replaced by IDNET in the very late 90s, with the 4010.

System Sensor’s “CLIP” protocol and its newer high speed versions work off this same principle of alternating the power and the data. If you put a multimeter on an SLC loop it is possible to read both DC and AC voltage. The SLC loop specifications say that it puts out 30 to 32 VDC and about 10 VAC. I normally get 15 VDC and 10 VAC on a loop when I put my meter on it. The reason for only getting half is because of the alternation that it does.

I wish I had an oscilloscope that I could hook up to it to see exactly what is happening here though.

Same thought here with the scope. You can do just about anything on those.

@Retired STR-SG

The 10 volt data for the card polling the devices is Mapnet II. Mapnet I used about half of that level. The change from type I to type II was a hardware improvement. The data level was increased and there were changes to the receive circuit in the field devices. That happened during 2120 CDT times. Mapnet I was long gone when 4100 came out. The type I devices are compatible with type II panel hardware. I replaced several early addressable 2120 systems using Mapnet I field devices with 4100 network systems.

Ok, that makes sense.

So how does polling work? like how does the device report everything?