With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ctpRS232PeripheralIndex
ctp RS232 Peripheral Index
1.3.6.1.4.1.9.9.643.1.2.5.1.1
This object specifies a unique number for a peripheral RS-232. If no peripheral has more than one RS-232, this object will have value '1'. Note that some Telepresence systems have no RS-232 port.
Back to CISCO-TELEPRESENCE-MIB MIB page.
IPHost Network monitor allows you to monitor ctpRS232PeripheralIndex 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.