Jason,
This is my IOS config for a 1721 but should work on other routers with
an AUX port.
The aux port corresponds to line 5 (show line will identify it).
Encapsulation is set to slip but you can also set it to ppp. Connection
to a PC serial port is via a normal Cisco (blue) rollover cable.
!
interface Async5
ip address 192.168.44.1 255.255.255.0
encapsulation slip
async mode dedicated
!
!
line aux 0
modem InOut
transport input all
flowcontrol hardware
rxspeed 19200
txspeed 19200
!
!
I would be most interested to see your perl script
Regards,
Nick.