Parport to 7i92

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13 Jun 2022 21:38 #245090 by looping
Replied by looping on topic Parport to 7i92
Channel 1 of the oscilloscope on 485+
Channel 2 of the oscilloscope on 485-
and Ground of the oscilloscope on Gnd.
Gives IMG_20220611_121629.jpg

Is that what you mean ?
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14 Jun 2022 16:04 #245131 by scotth
Replied by scotth on topic Parport to 7i92
If this is the device you have, it appears to have a termination resistor built in. so you might only need it at the drive end.
See R13.
Try that and see if the overshoot on A is reduced.
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18 Jun 2022 15:31 #245398 by looping
Replied by looping on topic Parport to 7i92
OK I will.

One question about this module : I connected Gnd and Vcc to an Usb port of the PC.
But with my 1.5kw it's working without the Usb plugged. Looking at the schematics, I don't understant how this is possible.

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02 Jul 2022 11:59 #246433 by looping
Replied by looping on topic Parport to 7i92
Today I added a 120 ohm resistor only on the VFD side. The Rs485 converter is powered with 5V.
With SpindleTalker2 on a windows laptop, I can talk to the VFD .
But with my LinuxCnc, it is still a failure.
I unpluged again the 2.2Kw and connect the old 1.5Kw, and LinuxCnc comm is OK.
I guess I have to get my oscilloscope to compare SpindleTalker2 and LinuxCnc  signals ! Any idea on what should I look at ?

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02 Jul 2022 12:40 #246436 by tommylight
Replied by tommylight on topic Parport to 7i92
1.5kw and 2.2kw, are you refering to spindle or VFD.

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02 Jul 2022 13:21 - 02 Jul 2022 13:22 #246439 by looping
Replied by looping on topic Parport to 7i92
To the VFD.
I have spindle for both. At the moment only the 2.2Kw spindle is connected to  the 2.2Kw VFD.
The 1.5Kw spindle is stored
Last edit: 02 Jul 2022 13:22 by looping.

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02 Jul 2022 22:33 #246475 by looping
Replied by looping on topic Parport to 7i92
May be serial Com port is faulty. (even if I could talk to the 1.5Kw VFD )
So I took an other desktop computer, fresh install LinuxCnc 2.8.2
With the same Rs485 adaptor, same wiring, 2.2Kw VFD, I have the same result as with dedicated linuxCnc box : no comms

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03 Jul 2022 09:34 #246486 by andypugh
Replied by andypugh on topic Parport to 7i92
Maybe it is worth trying the HY_GT_VFD version of HY_VFD?

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04 Jul 2022 10:45 #246571 by looping
Replied by looping on topic Parport to 7i92
I tried thé hy_gt_vfd but also comms error.
Do you know à mobus test application for linuxcnc ?

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04 Jul 2022 11:56 #246575 by andypugh
Replied by andypugh on topic Parport to 7i92
You could try mb2hal
linuxcnc.org/docs/stable/html/drivers/mb2hal.html
But my understanding is that HY VFDs don't talk real ModBus, but rather their own modbus-like protocol.

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