I am not at my shop right now but if the IEEE 1284 spec vs standard printer port spec makes a difference in terms of the PWM signal that could be my issue IF the IEE1284 spec would literally invert the signal somehow vs std printer port.
The C11G board has a jumper for "1284 compliant" or "not", and my board is set to not compliant. I was not sure if the UC400eth was 1284 compliant. I even emailed their tech support and got an answer that cut and pasted from the manual that was not all that clear to me. see below. I interpreted it to be saying a standard printer port but maybe I will email again to be sure. I am not sure about the LED dimming and brightening (there are tons of leds that light up on the board) but I measured voltages going to VI on the VFD and they go down when I increase speed in Mach3 so I was assuming the signal was inverted from Mach, not that there was a possible issue with the board setup. see below for jumper section of manual on board as well as my correspondence with their tech support
Hi
I have a new bob with a jumper for IEEE 1284 compatibility
what I should set it to for the UC400ETH? – I see no mention of IEEE 1284 in the manual but want to be certain
Thanks!
Dear Lindsay,
In the manual you can find information about it on page 18-19.:
http://cncdrive.com/MC/UC400ETH%20datasheet/UC400ETH_manual.pdf"There are 2 pieces of IDC26 I/O ports on the board. Both ports has the same pinout. The pinout is the same as the pinout of a standard LPT port in addition the 26. pin (there is no 26.pin on the LPT port) has a 5Volts power output."
"Plugging a IDC26 to DSUB25 female crimped cable to the IDC26 ports the DSUB25 port will have exactly the same pinput as the standard LPT printer ports on PCs."
Best Regards,
Csaba Nemeth
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Csaba Nemeth
25 Pafrany utca, Pecs, 7633 Hungary
Tel.:+36-70-932-0327
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