On Mon, 2012-06-25 at 16:16 +0430, Robot Abzar Team wrote: > Hi , > > I could solve the problem , it was not about software or hardware , just I > have to change something in BIOS . > Now machine work nice and perfect . > > Regards > Parviz
Just to fill some details. Since a BIOS setting fixed the problem, the motherboard parallel port must be the port used with the G540 in this case. The BIOS has a setting to enable the port, a setting for the address used, plus a mode setting. The G540's drive enable input (charge pump) http://wiki.linuxcnc.org/cgi-bin/wiki.pl?About_Charge_Pumps pin needs a fair amount of drive to get it to enable the drive, but with the parallel port pin which is normally used, has an open collector configuration which can be thought of as a simple switch. Switches can open or close a connection, but can't drive a load, so the drive enable doesn't work. One fix (workaround, or hack, depending on ones view) is to put the parallel port into EPP mode, which for most common parallel ports happens to change how the parallel port drives the enable pin and can usually drive the G540 enable pin. If an add on parallel port is used, the BIOS can't be used to change the mode of the new port. The port needs to have a utility or software driver to set the mode. Another option is to leave the parallel port pin as an open collector switch and add a buffer chip or pull-up resistor. The pull-up, being tied to +5 Volts, supplies power to the enable signal and drives the G540 pin, the parallel port pin shorts the signal to ground as needed. Or, usually the open collector output has a tiny bit of drive and a buffer chip can be used to boost it. The G540 also has a an enable override switch that can force the drive to be enabled. Some of my files on my study of the G540: http://wallacecompany.com/machine_shop/G540/ Tracing the enable signal: http://wallacecompany.com/machine_shop/G540/G540_upper_bottom_z-1b.png Motherboard signal with SPP mode: http://wallacecompany.com/machine_shop/G540/g540_mb_spp.jpg note that the signal only goes to two Volts. Motherboard signal with EPP mode: http://wallacecompany.com/machine_shop/G540/g540_mb_epp.jpg note that the signal is boosted to about 3.2 Volts which is enough to get the enable to work. Here is a buffered signal: http://wallacecompany.com/machine_shop/G540/g540_siig_buf.jpg which gives a full 5 Volt swing. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
