You can enter Cisco IOS commands and parameters through the CLI. Access the CLI either by connecting your PC directly to the switch console port or through a Telnet session from a remote PC or workstation.
Follow these steps:
1. Connect the supplied RJ-45-to DB-9 adapter cable to the standard 9-pin serial port on the PC. Connect the other end of the cable to the switch console port.
2. Start a terminal-emulation program on the PC.
3. Configure the PC terminal emulation software for:
-8 data bits
-1 stop bit
-No flow control
Catalyst 3750 Integrated Wireless LAN Controller Switch Getting Started Guide
Thanks for the response. I tried 9600 8None1 first but got no response. I then tried various other speeds but still no response from the controller. I accessed the switch ok via the console port. Apparently you can then connect to the controller using the 'session 1 processor 1' command, but this does not work either. This failed with a message stating something like 'telnet access not allowed to this device'.