Glasmaßstab EIA-422 an Mesa 7i85 (S)

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31 Jul 2025 15:32 #332603 by Asymmetrisch
Glasmaßstab EIA-422 an Mesa 7i85 (S) was created by Asymmetrisch
Hallo zusammen,

leider bin ich mir trotz vielem Lesen noch immer nicht sicher, wie Glasmaßstäbe mit EIA-422-Schnittstelle korrekt an Mesa-Karten (z.B. 7i85 oder 7i85S) angeschlossen werden können - wird hier ein Signalkonverter benötigt?
Wenn ja, wäre hierzu der "422ENC One channel RS-422 to TTL adapter" von Mesa geeignet?


Danke,
Gerhard

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31 Jul 2025 16:30 #332605 by PCW
Replied by PCW on topic Glasmaßstab EIA-422 an Mesa 7i85 (S)
No additional hardware is needed, you simply make sure the 7I85S
is jumpered for differential mode (this is the as-shipped default)

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31 Jul 2025 17:09 #332607 by Asymmetrisch
Replied by Asymmetrisch on topic Glasmaßstab EIA-422 an Mesa 7i85 (S)
Thank you very much for your quick reply.
The 5 serial connectors on the 7i85 (without "S") are outputs for drives with RS-422 interface, correct?

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31 Jul 2025 17:31 #332609 by PCW
Replied by PCW on topic Glasmaßstab EIA-422 an Mesa 7i85 (S)
The RS-422 interfaces on the 7I85 are most commonly used
for SmartSerial I/O expansion but can be used for other RS-422
uses like absolute encoders (SSI or BISS)
The following user(s) said Thank You: Asymmetrisch

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03 Aug 2025 10:18 #332714 by WKS-3D
Replied by WKS-3D on topic Glasmaßstab EIA-422 an Mesa 7i85 (S)
Hallo zusammen,

erinnert durch dieses Thread hier, dass ich meine Glasmaßstäbe noch nicht zu 100% am Laufen habe,
hänge ich mich mal hier dran.

Ich habe die Ditron DC11 an meiner Drehmaschine verbaut, diese funktionieren soweit auch,
allerdings bekomme ich kein Indexsignal, also muss ich mit Referenzschaltern arbeiten, was
wieder zu Ungenauigkeiten führt. Das würde ich gerne noch ändern und hoffe, dass ihr mir dabei helfen könnt.

Hier ist die Pinbelegung welche ich an der 7i85 (ohne S) benutzt habe:
 
 

und hier die HAL und INI:
 

File Attachment:

File Name: probe_basic_lathe.ini
File Size:5 KB

 

File Attachment:

File Name: hera_probe...athe.hal
File Size:13 KB

 
Attachments:

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09 Aug 2025 09:03 #333100 by Asymmetrisch
Replied by Asymmetrisch on topic Glasmaßstab EIA-422 an Mesa 7i85 (S)
Bei den SINO-Glasmaßstäben ist die gleiche Pinbelegung wie bei den Ditron angegeben, sollte also so passen.
In der Bedienungsanleitung steht "Nullpunkt-Position: eine alle 500 mm" - weißt du, wo die auf deinen Maßstäben liegen?

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09 Aug 2025 17:58 #333138 by PCW
Replied by PCW on topic Glasmaßstab EIA-422 an Mesa 7i85 (S)
To use index, you would need to uncomment these and similar lines

#net x-index-enable joint.0.index-enable <=> hm2_7i92.0.encoder.00.index-enable

and change:

HOME_USE_INDEX NO
to
HOME_USE_INDEX YES

And know where the physical index mark is on your scale as Asymmetrisch mentioned.

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10 Aug 2025 07:24 #333145 by WKS-3D
Replied by WKS-3D on topic Glasmaßstab EIA-422 an Mesa 7i85 (S)
@Asymmetrisch
Ja, die liegen wohl am Anfang und in der Mitte, aber beim Darüberfahren kommt keine Rückmeldung.

@PCW
Yes, I know, that's how I had it originally, but there is no feedback from the index signal, so I commented it out again and am currently using the limit switch as a reference point.
It should actually be that when searching for the index point, the motor moves toward the limit switch, and if the index is not in the area traveled, it turns around at the limit switch and searches in the other direction.
The index should be at the beginning and in the middle.

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10 Aug 2025 13:59 #333161 by PCW
Replied by PCW on topic Glasmaßstab EIA-422 an Mesa 7i85 (S)
Are you sure you scales have an index?


One way to check is to setup halshow to watch  hm2_7i92.0.encoder.00.index-enable
and then:

setp hm2_7i92.0.encoder.00.index-enable true

hm2_7i92.0.encoder.00.index-enable should go high  but return low when the
index is detected (either jog or manual move the joint past the index)

This assumes the 

#net x-index-enable joint.0.index-enable <=> hm2_7i92.0.encoder.00.index-enable

Line remains commented out.

 

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13 Aug 2025 07:33 #333315 by WKS-3D
Replied by WKS-3D on topic Glasmaßstab EIA-422 an Mesa 7i85 (S)
@PCW
Okay, I'll try it next weekend and let you know how it goes.

Ps.: By the way, I've always wanted to ask you, what's with the goat in the picture? 

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