[chirp_users] FT-817ND Howto?

Hi,     Can anyone direct me to the howto for the 817?  I tried putting my ND in clone mode as the source and clicked on chirp to read from but get a com error.  I tried a rate of 38400 and 4800 on the ND with error indications from chirp.   Used a data cable that works for Ham Radio Deluxe and FT-817 Commander.  I'll take a pointer to the instructions if that's simpler to post.                                                                Kurt KC9LDH