I have a couple of these units that I'm trying to get working too.
I'll post any info I discover back here when I get them sorted out, so check back every now and then.
If you come up with any info in the meantime, could you please post it here too?
(that may save me some effort as well!
The only info I have at the moment is:
- you must use a power supply that produces > 8 volts AC - a negative voltage is generated to run the RS232 transceivers.
- the unit seems to default to it's RS422 comms mode (at least on my units), but it can be switched to RS232 via a relay (not that I know the code to do that yet....), so I've temporarily bypassed the relay so I can use rs232 - however, you need to be wary doing this as the unit does a serial loop-back test on boot-up and will fail the system if you hardwire the rs232 transceivers the wrong way.
I'll add more when I've done more testing (don't hold your breath though - I'm very busy....
)