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Entry  Fri Mar 19 19:15:13 2021, Jon, Update, CDS, c1auxey assembly 
    Reply  Thu Mar 25 12:11:53 2021, Yehonathan, Update, CDS, c1auxey assembly 20210325_115500_HDR.jpg20210325_123033.jpg
       Reply  Thu Mar 25 14:16:33 2021, gautam, Update, CDS, c1auxey assembly 
       Reply  Tue Mar 30 17:27:04 2021, Yehonathan, Update, CDS, c1auxey assembly 
          Reply  Wed Aug 25 11:48:48 2021, Yehonathan, Update, CDS, c1auxey assembly 
             Reply  Mon Sep 13 14:32:25 2021, Yehonathan, Update, CDS, c1auxey assembly ETMX_OSEMS_Noise.png
                Reply  Wed Sep 15 11:27:50 2021, Yehonathan, Update, CDS, c1auxey assembly c1auxex_Grounding_OSEM_comparison1.pdfc1auxex_Grounding_OSEM_comparison2.pdf
       Reply  Thu Apr 15 17:24:08 2021, Jon, Update, CDS, Updated c1auxey wiring plan C1AUXEY_Chassis_Feedthroughs_-_By_Connector.pdf
          Reply  Mon Apr 19 21:54:55 2021, Yehonathan, Update, CDS, Updated c1auxey wiring plan 
             Reply  Wed Apr 28 18:56:57 2021, Yehonathan, Jon, Update, CDS, Updated c1auxey wiring plan 
                Reply  Thu Apr 29 16:35:51 2021, Yehonathan, Update, CDS, Updated c1auxey wiring plan 
                   Reply  Thu Apr 29 19:55:45 2021, Yehonathan, Update, CDS, Updated c1auxey wiring plan 
                      Reply  Fri Apr 30 19:18:51 2021, Yehonathan, Jon, Update, CDS, Updated c1auxey wiring plan 
                         Reply  Mon May 3 20:36:46 2021, Yehonathan, Jon, Update, CDS, Updated c1auxey wiring plan 
                            Reply  Sun May 23 18:28:54 2021, Jon, Update, CDS, Opto-isolator for c1auxey 
                               Reply  Fri May 28 10:54:59 2021, Jon, Update, CDS, Opto-isolator for c1auxey optoisolator.jpeg
                                  Reply  Thu Jun 3 17:15:17 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey Optical_Isolator_NPN_Input.pngOptical_Isolator_NPN_Output.png
                                     Reply  Thu Jun 3 22:08:00 2021, Koji, Update, CDS, Opto-isolator for c1auxey 
                                        Reply  Fri Jun 4 14:49:23 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey Optical_isolator_Wiring.pdf
                                           Reply  Fri Jun 4 17:46:25 2021, unYehonathan, Update, CDS, Opto-isolator for c1auxey 20210604_173420.jpg
                                              Reply  Sun Jun 6 16:33:47 2021, Jon, Update, CDS, BI channels on c1auxey 
                                                 Reply  Mon Jun 7 13:14:20 2021, Yehonathan, Update, CDS, BI channels on c1auxey 
                                                    Reply  Tue Jun 8 11:54:39 2021, Yehonathan, Update, CDS, BI channels on c1auxey 
                                           Reply  Sun Jun 6 03:02:14 2021, Koji, Update, CDS, Opto-isolator for c1auxey 
                                              Reply  Sun Jun 6 12:15:16 2021, Jon, Update, CDS, Opto-isolator for c1auxey 
                                              Reply  Sun Jun 6 15:59:51 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey Optical_isolator_Wiring.pdf
                                                 Reply  Mon Jun 14 15:31:30 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey Optical_isolator_Wiring.pdf
                                                    Reply  Tue Jun 15 21:48:55 2021, Koji, Update, CDS, Opto-isolator for c1auxey Acromag_RTS_BI_config.jpg
                                                       Reply  Wed Jun 16 17:24:29 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey Optical_isolator_Wiring.pdf
                                                          Reply  Wed Jun 16 20:32:39 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey 
                                                             Reply  Fri Jul 9 18:35:32 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey 
                                                                Reply  Mon Jul 12 18:06:25 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey 
                                                                   Reply  Wed Jul 28 12:47:52 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey SUS-ETMY_SparePDMon0_NoRef.pngSUS-ETMY_SparePDMon0_Ref_WithGND.pngDifferentialOutputTest.png
                                                                      Reply  Wed Aug 11 12:06:40 2021, Yehonathan, Update, CDS, Opto-isolator for c1auxey SUS-ETMY_SparePDMon0_2.png
Message ID: 16183     Entry time: Fri Jun 4 17:46:25 2021     In reply to: 16182     Reply to this: 16188
Author: unYehonathan 
Type: Update 
Category: CDS 
Subject: Opto-isolator for c1auxey 

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

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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