Hi Simon,
Thanks for your input - I haven't had the time until tonight to get back on this, your right it is simple - via the keyspan at the moment - I'll attempt it with the TCPIP at another time.
The very basic codes I've used are to change Input 1a to dvi1 is:
"F0410410082000010E7" [0d]
and to DVi2:
"F0410410082000011E8" [0d]
i'm using the TVone rs232 guide pdf which can be found here:
http://tvone.crmdesk.com/answer.aspx?aid=381&back=