With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
fcmInstanceSoftwareIndex
fcm Instance Software Index
1.3.6.1.2.1.10.56.1.1.1.5
If this management instance corresponds to an installed software module identified in the Host Resources MIB, then this object's value is the value of the hrSWInstalledIndex of that module. If there is no correspondence to an installed software module (or no module that has a hrSWInstalledIndex value), then the value of this object is zero.
Back to FC-MGMT-MIB MIB page.
IPHost Network monitor allows you to monitor fcmInstanceSoftwareIndex 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.