With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
serialPortEnable
serial Port Enable
1.3.6.1.4.1.351.110.4.1.1.1.3
This object is used for enabling/disabling serial port.
Back to BASIS-SERIAL-MIB MIB page.
IPHost Network monitor allows you to monitor serialPortEnable on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.