With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
snaLuOperDisplayModel
sna Lu Operational Display Model
1.3.6.1.2.1.34.1.2.2.1.6
The screen model type of the terminal connected to the host. If this LU is not Type 2, then this object should contain the 'invalid(1)' value.
Back to SNA-NAU-MIB MIB page.
IPHost Network monitor allows you to monitor snaLuOperDisplayModel on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.