Here you go::::::
Download TNC REMO from Heidenhain's site - set it up and run TNCSERVER
Make up a cable from 25way TNC151B to 9 way PC as follows:
(25way TNC) <9 way PC>
(2) - <2>
(3) - <3>
(4) - <8>
(5) - <7>
(6) - <4>
(7) - <5>
(20) - <6>
The TNC RS232 interface can exist in three modes - "EXT", "ME", and "FE" selected via the 'MOD' key - it should be in "FE"
File names & extensions ARE important in block mode transmission. 123.H = program 123 in Heidenhain conversational code and 123.I is program 123 in ISO-Gcode
When set up like the above it will work - it took me ages to sort it but now all is reliable.
Andrew Mawson
East Sussex, UK