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Fri Mar 19 19:15:13 2021, Jon, Update, CDS, c1auxey assembly
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Thu Mar 25 12:11:53 2021, Yehonathan, Update, CDS, c1auxey assembly 
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Thu Mar 25 14:16:33 2021, gautam, Update, CDS, c1auxey assembly
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Tue Mar 30 17:27:04 2021, Yehonathan, Update, CDS, c1auxey assembly
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Wed Aug 25 11:48:48 2021, Yehonathan, Update, CDS, c1auxey assembly
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Mon Sep 13 14:32:25 2021, Yehonathan, Update, CDS, c1auxey assembly
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Wed Sep 15 11:27:50 2021, Yehonathan, Update, CDS, c1auxey assembly 
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Thu Apr 15 17:24:08 2021, Jon, Update, CDS, Updated c1auxey wiring plan
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Mon Apr 19 21:54:55 2021, Yehonathan, Update, CDS, Updated c1auxey wiring plan
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Wed Apr 28 18:56:57 2021, Yehonathan, Jon, Update, CDS, Updated c1auxey wiring plan
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Thu Apr 29 16:35:51 2021, Yehonathan, Update, CDS, Updated c1auxey wiring plan
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Thu Apr 29 19:55:45 2021, Yehonathan, Update, CDS, Updated c1auxey wiring plan
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Fri Apr 30 19:18:51 2021, Yehonathan, Jon, Update, CDS, Updated c1auxey wiring plan
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Mon May 3 20:36:46 2021, Yehonathan, Jon, Update, CDS, Updated c1auxey wiring plan
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Sun May 23 18:28:54 2021, Jon, Update, CDS, Opto-isolator for c1auxey
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Fri May 28 10:54:59 2021, Jon, Update, CDS, Opto-isolator for c1auxey
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Thu Jun 3 17:15:17 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey 
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Thu Jun 3 22:08:00 2021, Koji, Update, CDS, Opto-isolator for c1auxey
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Fri Jun 4 14:49:23 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey
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Fri Jun 4 17:46:25 2021, unYehonathan, Update, CDS, Opto-isolator for c1auxey
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Sun Jun 6 16:33:47 2021, Jon, Update, CDS, BI channels on c1auxey
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Mon Jun 7 13:14:20 2021, Yehonathan, Update, CDS, BI channels on c1auxey
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Tue Jun 8 11:54:39 2021, Yehonathan, Update, CDS, BI channels on c1auxey
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Sun Jun 6 03:02:14 2021, Koji, Update, CDS, Opto-isolator for c1auxey
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Sun Jun 6 12:15:16 2021, Jon, Update, CDS, Opto-isolator for c1auxey
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Sun Jun 6 15:59:51 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey
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Mon Jun 14 15:31:30 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey
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Tue Jun 15 21:48:55 2021, Koji, Update, CDS, Opto-isolator for c1auxey
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Wed Jun 16 17:24:29 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey
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Wed Jun 16 20:32:39 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey
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Fri Jul 9 18:35:32 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey
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Mon Jul 12 18:06:25 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey
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Wed Jul 28 12:47:52 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey  
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Wed Aug 11 12:06:40 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey
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Message ID: 16183
Entry time: Fri Jun 4 17:46:25 2021
In reply to: 16182
Reply to this: 16188
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Author: |
unYehonathan |
Type: |
Update |
Category: |
CDS |
Subject: |
Opto-isolator for c1auxey |
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I mounted the optoisolator on the DIN rail and connected the 3 first channels
C1:SUS-ETMY_UL_ENABLE |
C1:SUS-ETMY_UR_ENABLE |
C1:SUS-ETMY_LL_ENABLE
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to the optoisolator inputs 1,3,4 respectively. I connected the +15V input voltage into the input(+) of the optoisolator.
The outputs were connected to DB9F-2 where those channels were connected before.
I added DB9F-1 to the front panel to accept channels from the RTS. I connected the fast channels to connectors 1,2,3 from DB9F-1 to DB9F-2 according to the wiring diagram. The GND from DB9F-1 was connected to both connector 5 of DB9F-2 and the output (-).
I tested the channels: I connected a DB9 breakout board to DB9F-2. I measured the resistance between the RTS GND and the isolated channels while switching them on and off. In the beginning, when I turned on the binary channels the resistance was behaving weird - oscillating between low resistance and open circuit. I pulled up the channels through a 100Kohm resistor to observe whether the voltage behavior is reasonable or not. Indeed I observed that in the LOW state the voltage between the isolated channel and slow GND is 15V and 0.03V in the HIGH state. Then I disconnected the pull up from the channels and measured the resistance again. It showed ~ stable 170ohm in the HIGH state and an open circuit in the LOW state. I was not able to reproduce the weird initial behavior. Maybe the optoisolator needs some warmup of some sort.
We still need to wire the rest of the fast channels to DBF9-3 and isolate the channels in DBF9-4. For that, we need another optoisolator.
There is still an open issue with the BI channels not read by EPICS. They can still be read by the Windows machine though. |
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