Any guides / docs for monitoring devices via Modbus?

Got a Procon A1M tied to an air conditioning system, need to monitor it via a RS-485 to Ethernet adapter.
Adding the host with the IP works out of the box or is there some other config to do on the check_mk appliance? (enterprise edition)

Hi Joe,

do you have any news or solutions to this topic ???
I get following Error
OMD[ensag]:/opt/omd/sites/ensag/local/share/check_mk/agents/special$ ./agent_modbus 10.124.176.xx 502 856:2:counter:active_energy 790:2:gauge:active_power\n
error: Bad file descriptor
Greets Bernd