When working on PSK31, the plug n play RTT light stays on when sending. But when you cut over to say to cw, then the yellow or RTT light will come on. SO now?
I see lots of comments here about external keying lines, etc. Based upon your comments, I assume you're switching Fldigi to CW and then switching the 897D to CW mode as well? Right?
Well, don't. Try this.
Set it up just the way you do for PSK31....leave the rig in DATA mode (or whichever mode you have it working in for PSK31) and then simply switch Fldigi to CW mode. Do NOT switch the rig to CW. Send a few V's and I'd bet that it works just fine.
Fldigi does not do true CW...it does, for lack of a better term, ACW (similar to AFSK)....audio injected CW. If you are operating correctly and cleanly using PSK31, you'll have no problem doing the same for CW. It is NOT MCW like some erroneously suggest and is perfectly legal. The key is to make sure you have 0 (none, zip, nada) ALC action when keying.
The reason why your lights are coming on when you switch over the CW mode is that Fldigi is triggering the PTT, but there is not interruption sent by Fldigi to "key" morse code, so it sends a steady tone.