Serial Comm between PLC and Managed Switch

[jxm1092 0]

I have a Horner PLC which is cable of doing RS-485 or RS-232 serial communication as well as ethernet. I am using this in conjunction with a managed NTron 716TX switch. I need to know what device is physically connected to what port on the switch. You can do this through the serial port on the switch by accessing what they call the ARL table which will list the VLAN it's in, the MAC address of the device and what port its coming through. I will know the VLAN and a short list of MAC addresses to check against, but the issue is I'm not really sure how to do this or where to begin? Looking for some help to be pointed in the right direction. I am using structured text as well and not ladder logic for what it's worth.