Lee, a full user's manual is at http://www.cirrus.it/pdf/232_2942.PDF I am writing a VB6 prog to display a timing diagram from the RS232 dump as I can find NO-ONE that has got or ever had a copy of the LA-PC-Link software ! These things seem to proliferate on EBay but no-one seems to discuss them! (no-one is re-writing the ROM to provide some of the extended facilities ROM features ???) Are you (anybody?) still using an LA160 ? if so (or for more info :-) ) contact me on alan.needham_at_humberpower.co.uk