Collecting uptime data from HPLC

I'm not sure if this is the right place to ask this, but we would like to collect availability/uptime data from our HPLC systems (we use 1100, 1200 and 1260 series). We have another system that calculates OEE from several types of machines and now we'd like to add HPLCs to this system. We want to know in real time when the system is running, not used or when the system is in error state. Our OEE system reads I/O data, so we'd need I/O signals from these different states.  
 
So far I've been toying with an idea of using ERI or APG remote to get those signals but I'm not sure if this is anywhere near feasible. Does anyone have experience on collecting this kind of data?  
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