> > ppmc purchased from pico systems:
> > -motherboard
> > -dac card
> > -dio card
> > -encoder card
> >
jon Elson wrote:
> Hmmm, that is pretty old. You may need some firmware updates on the
> boards. Can you give me the labels on the big chips of the DAC and DIO
> board, and the date code scratched into the EPROM on the encoder board?
> (Sorry, I know those are hard to read, I'm using printed labels, now.)
> I think these boards may still work with a current EMC2 version, but
> some of the features like homing to index pulse won't work.
The DAC board the label is
dac
1/13/02
the Dio board the label is
dio1/13/02
The date code on the encoder board EPROM (8 pin U2) is1/13/02
> If there are no chips installed in U3 - U5, then it is single-ended. I
> could install the differential receivers and update the firmware for
> you. However, you should be able to read movement by just connecting
> the A, B and M true signals and ignoring the complement for now.
>
I do not have those chips i.e. it is single ended.
I may just hook them for now to test, but what is the advantage to differential?
Is it OK to ask what the upgrade would cost here or should I go to the website?
> You must have an IEEE-1284 compliant cable to use the PPMC. It should
> work fine with on-motherboard parallel ports, but may be flaky with PCI
> plug-in parallel ports, which run much faster. If you have this problem
> (detectd by the commtest described below) I have a fix for it, but will
> need to get the motherboard back to install the fix.
> Before running EMC, you should load and install the diagnostics program
> for the PPMC, it will make it easier to test and verify that it is
> working right.
> After the diags program shows correct operation (most important test is
> commtest that tests reliable communications between computer and PPMC)
> you then need to verify that EMC gets the right direction and measured
> movement when you manually move the motors. Once the encoders are
> reading into EMC correctly, then you can start setting up the servo amps
> and tuning. Do not spend a lot of time getting precise servo tuning, it
> will all change when the motors are mounted on the machine.
> See http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?PWM_Servo_Amplifiers for
> info on servo tuning. This was written for my PWM servo amplifiers and
> the PWM controller, but a large part of it is very applicable to the
> PPMC as well.
>
> Jon
>
That should give me enough to start with given the amount of free time I have.
Thank you
Mike Langeweg
P.S. All the boards I have are labeled with what board it is and SN0007
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