http://qkpm2ov2rjhjkhfsftskqho77uj5rewd5y44unkf6cb7tdhaxwcvh2id.onion/books/apc/APCUPSD%20User%20Manual.html
The protocol is much simpler
and potentially more secure than SNMP. modbus MODBUS is the newest APC protocol and operates over RS232 serial links or
USB. MODBUS is APC's replacement for the aging 'apcsmart' (aka UPS-Link)
protocol. MODBUS is the only way to access detailed control and status
information on newer (esp.