![]() The guys had me try several things and we ran a program called showport and dmesg. It looks like if pin 1 stobe is low Unbuntu thinks there is no printer attached and disables the PP. When the cable is disconnected and the PC rebooted then the port stays in the EPP mode and thus when connected to the G540 the CP works and the G540 comes out of Fault. With the cable connected you can see that during boot up the PP changes the setting and shows a different amplitude. To prove that Unbuntu was the problem I connected my Tectronics scope to a breakout board and watched the CP pin 16. If however during boot up I have the PP cable disconnected and after Unbuntu is booted up and at the desktop I plug in the PP cable and then start EMC I get the green power light on the G540. In Unbuntu and linuxcnc and with the cable connected to the G540 the G540 will not come out of the fault stage. With the same PC and same PP cable and same G540 with the CP switched on Windows and Mach3 work fine and the Charge Pump takes the G540 out of the Fault state. We have had quite a discussion on the Yahoo DIY_CNC group about my problem with Unbuntu changing the state of my parallel port on my Dell GX260 PC from EPP with my G540 during boot up. ![]()
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