Working from first principles (without detailed knowledge of the M710):
. . . Does the M710 have a PTT (push-to-talk) line to the microphone? Or is there a PTT pin on a rear-panel connector?
If so, you should be able to use any standard sound-card interface between the computer and the M710.
. . . What kind of rear-panel "data" socket do you have?
. . . What kind of sound card are you using?
. Charles
PS -- I assume you're on the WINMOR group in Yahoo:
http://groups.yahoo.com/group/WINMORSomebody there might be an M710 user.