Hi Mike,
There is an "Ubbe" in the Swedish section of this forum saying you shouldn't use the TTL port but the AUX/MIC port instead.
And there is a Greek user also saying to have problems , with the on/off switch?
But if you have a R2500 yourself and working via TTL, I'll start making cables :-)
IC703 works fb...
73
Paul
PD0PSB