That's an interesting way of deploying PDU's--daisy chaining them.
I monitor APC PDU's in our data centers with NPM--but each one is stand-alone, has its own IP address, snmp strings, unique name, etc. It works very well with NPM. I'm hoping your Chatsworth PDU's can be monitored with NPM in ways that suit your needs. If you get it going, please post pictures of now NPM discovers & displays the daisy-chaining. That sounds pretty fun!
Require MIB/OID - Information for Chattsworth PDU's - Can anyone share please
P/N : P6-1F0A1-C2A