Have you tried setting the serial interface to an EXT mode and using something other than TncServer? I think the 355 should go to 38K baud. I assume you are running in FE mode and have tried setting the baud rate up (has to be done at both ends)? I would make sure machine parameter 7460 is set to something reasonable (like 10 or 20) just in case that is part of the problem. That control was made way before things were done this way. Many of these CAM programs spit out a lot more than that - like most programmers everywhere their authors seem to think that memory is free and processing speed is infinite. If you are doing HSM paths with bunches of little line segments at high feed, lets say 400 ipm then that's 6.6 inches per second or only 4 or 5 lines/inch of machining before you starve. 9600 baud should get you at least 600-700 characters/sec, if there are 25 characters on a line average then that is 25 or 30 lines a second. I file is just 'Heidenhain' for ISO, or G-code.
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