PXI-8431 not going into receive mode with VB6

I am using a PXI-1045 chassis with a PXI-8431 RS422/485 card and communicating via a VB6 program
The output of the PXI-8431 RS485 module works OK when it is in send mode, the signal levels are approx 1v and 3v for high and low, but when it is in receive mode the outputs remain at 1v and 3v instead of going into passive mode and both lines floating at approx 2v with approx 300mV differential as they should. This means when the remote devices send, the amplitude of the signal is approx half as they are competing with the PXI module, and that the centre point of the two signals are at 1v and 3v respectively. Our software does not receive the signals from the PXI module which is consistent with my theory that it is still in send mode and taking control of the lines, or maybe it has changed it to 4 wire mode.
I have swapped over the PXI card and the remote cards with our good system and the problem does not move.
I have eliminated ALL the hardware on the new ring by replacing it with a 67 Ohm resistor on the pins of a 9 way D connector plugged onto the PXI card directly. With a scope I can see that the new system is not going into passive mode, but with the same connector the old system works OK.
The only difference I can see between the 6 old rigs we have that do work and the 2 new ones that do not work is the new ones use the the NI-XNET-PXI-8513 and the old ones use the PXI_8464 CAN card. Could this software be conflicting? Is there any other updates to the NI software that could be causing it?
Solved!
Go to Solution.

Hi,
I've had a check to see if we have any known software conflict issues with those cards but it all seems fine, it could be that the Windows Driver layer is causing some issues. If you nip into Device Manager and go to the properties of the 8431 you should be able to change it to 2-wire mode from those settings then re-run the program.
Also does the program throw any errors at all in terms of device resources when trying to move from send to receive mode?
What versions of NI-VISA and NI-Serial do you currently have installed?
Kind Regards,
Applications Engineer

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[<c016a03d>] handle_mm_fault+0x11d/0x760
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[<c017c9ac>] do_sys_open+0xbc/0xe0
[<c018a82d>] sys_ioctl+0x5d/0x70
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[<c78634a0>] hid_output_report+0x130/0x310 [hid]
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[<c015dd35>] filemap_fault+0x215/0x470
[<c78987cc>] usbhid_submit_report+0x14c/0x1b0 [usbhid]
[<c789b076>] hiddev_ioctl+0x3f6/0xb40 [usbhid]
[<c016a03d>] handle_mm_fault+0x11d/0x760
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[<c018a508>] do_ioctl+0x78/0x90
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[<c018a82d>] sys_ioctl+0x5d/0x70
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=======================
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[<c78634a0>] hid_output_report+0x130/0x310 [hid]
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[<c789b076>] hiddev_ioctl+0x3f6/0xb40 [usbhid]
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[<c018a82d>] sys_ioctl+0x5d/0x70
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[<c78984d8>] hid_submit_ctrl+0x58/0x200 [usbhid]
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[<c789b076>] hiddev_ioctl+0x3f6/0xb40 [usbhid]
[<c016a03d>] handle_mm_fault+0x11d/0x760
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[<c0139507>] __atomic_notifier_call_chain+0x27/0x50
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[<c018a74e>] vfs_ioctl+0x22e/0x2b0
[<c017c9ac>] do_sys_open+0xbc/0xe0
[<c018a82d>] sys_ioctl+0x5d/0x70
[<c01044fa>] syscall_call+0x7/0xb
=======================
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Current Available (mA): 900
Current Required (mA): 224
Unfortunately there's no firmware update for this drive, which will probably fix this. See this topic: https://discussions.apple.com/thread/4196704.

Early 2008 iMac (8,1) randomly goes into sleep mode

Hey,
My early 2008 iMac (8,1) on 10.8.2 goes into sleep mode by itself. I've played around in Energy Saver, tried resetting SMC, NVRAM, replaced HDD, reformatted HDD, installed smcFanControl, reinstalled Snow Leopard, Lion, Mountain Lion. None of that worked. Took it to the Genius bar, performed some diagnostics tests and they said everything worked properly. Does anybody have the same problem? I can still use the computer for general computer use (light web surfing and e-mailing), but it seems to go into sleep mode when I have a lot of applications open and especially when watching videos. I've tried researching this problem, but I've haven't found a definitive answer. Right now, the Genius that I've been talking to thinks it may be the RAM. I'm waiting on new shipments of test RAM to arrive at the Apple Store for him to properly diagnose.
Thanks,
Jason
iMac (8,1)
2.8 GHz Intel Core 2 Duo
2x2 GB 800 MHz DDR2 SDRAM
ATI Radeon HD 2600 Pro 256 MB
1TB 7200 RPM SATA ST1000DM003-1CH162
If you want to read the whole time line, I've included it here. I apologize for it being so long.
At first I was running Lion (10.7.5) and the computer would enter sleep mode whenever I was doing anything with video. For example, watching YouTube videos and chatting on FaceTime. And funny enough, I distinctly remember watching a bunch of movies with VLC and the computer did not go to sleep (Although, this is not true anymore). I could wake the computer up and use it, however within a few minutes the computer would re-enter sleep mode. The computer seemed fine and I could access all of my files. Tried resetting SMC and it did not resolve the issue.
I made a Genius appointment to see if they were familiar with the issue. The iMac passed the in-store diagnostics test; it said all the components were functioning properly. He told me to bring it home to do a fresh re-install of my OS and then run my computer to see if the problem persisted. I took it home and reformatted my HDD with a 35-pass erase, re-installed Snow Leopard (10.6.8) and declined to transfer any backups from Time Machine. I was using a fresh system and sure enough, the problem persited. Tried doing the same thing again but with Lion (10.7.5) and still no luck. So I made another appointment and it passed the in-store diagnostics test again. I let them keep the computer for a 24-hour diagnostics test. They told me they would diagnose my computer with the OS on my HDD as well as a copy of OS that the Apple store deemed 'good' on an external HDD. The Genius called me and told me that my HDD failed their 24-hour diagnostics test and recommended I replace it. I initially had a 750 GB HDD, and the Apple Store could only offer me a 500 GB HDD ($200). I opted to take my computer to Carbon Computing, an authorized dealer in Toronto, to have a 1 TB Seagate HDD ($170) installed with no OS on it. I brought it home, performed another 35-pass erase and installed Snow Leopard. Problem still persisted. Repeated with Lion, still unsuccessful. Looking back, I was so excited that I just had to replace the HDD to fix the problem, I forgot to ask the guy if he could recreate the issue.
I began to suspect that it was a heating issue. So I installed Temperature Monitor and smcFanControl, and cleaned the fans as much as I could without taking the computer apart. Without smcFC on I tried to recreate the problem and I noticed that the Power Supply Position 1 reached 95 degrees Celsius, and Graphics Processor Temperature Diode reached 97 degrees Celsius before entering sleep mode. I don't know much about temperature sensors and what they monitor specifically, and so I couldn't draw any conclusions from that data. I turned on smcFC and cranked the optical drive speed to 2000 RPM, HDD to 3000, and CPU to 3000. The computer still went to sleep but the temperatures were below 90 degrees Celsius before entering sleep mode. I've tried researching here and on the internet about normal operating temperature ranges of iMacs and generally found that most do reached that temperature but they do not go to sleep mode.
Then I thought it may be a problem with Lion so I upgraded to Mountain Lion. The issue still persisted. Tried resetting SMC and NVRAM, did not resolve issue.
I called the same Apple Store explaining to them that their recommendation of replacing the HDD did not resolve the issue. They told me to bring it in and have them check it out again. I went through the same process I did before; the iMac passed all of their diagnostic tests. The Genius told me this time he will test out the RAM. He called me and told me that he could replicate the problem and so he proceeded to put in a stick of 'good' Apple RAM, but the computer would not work. He said the 'good' Apple RAM was damaged, either before or in the process of putting it in. He plugged in my old stick of RAM and the computer worked. He tried to recreate the problem and claimed that the computer ran for over 24 hours with an existing movie on my HDD playing and it did not go to sleep mode. However, once I brought it home I played the same movie right away and it turned off 17 minutes into the movie. Tried resetting SMC and NVRAM again, ran the movie again, still went to sleep.
And that's the story for now...

Now to find out WHY it does it at home only. How hot is it at home? Have you checked the AC current/voltage at home?
Well they were able to replicate the issue at the Apple Store the second time I left my computer there. Anyway, we don't have any heating on at my house at the moment. It's usually from around 20-23 degrees Celsius (72-75 F). Temperature Monitor says ambient temperature is 30 degree C though...
I'm not really sure how to check the AC current/voltage at home, but my computer worked before I moved it. So I'm not sure if that is the issue.
I normally only have speakers set up to my computer and a wired keyboard. The speakers are powered separately. I would assume that at the Apple Store only the power cord and wired keyboard are connected.
What is the Power Supply Position? And what does it do?
Thanks for your help!

IPhone 3gs wont turn back on once it goes into sleep mode!

2 days ago my iPhone 3gs (OS 6.0.1) has gone completely wacko on me and i'm completely frustrated! I have my phone set to have the screen shut off after 5 minutes. Usually, to just reaccess the phone I just simply hit the home button. Now, if I let it go into sleep mode, the phone WILL NOT come back on! I went online and did some research, and it suggested holding the home button and the sleep button for 10 seconds to get it to come back on. It works most times, but sometimes it takes a few tries to get it to come back on, and when it does come back on it takes forever to load up. But the whole thing happens all over again when it goes into sleep mode. My phone is fine as long as I set it to never go into sleep mode, but it is killing my battery. I need to be able to put it into sleep mode as I have to be able to go all day without charging it at my job. PLEASE help...I don't know what's going on with it. I have never done anything to it (jailbreaking, illegal stuff, etc.) and I do all the updates that it asks to do.
Please please help!
Jennifer.

If you actually see a "6" error code, here's what it means. Disable your anti-virus and/or firewall.
Errors related to third-party security software
Error 2, 4 (or -4), 6, 1000, 9006
Follow Troubleshooting security software. Often, uninstalling third-party security software will resolve these errors.
There may be third-party software that modifies your default packet size in Windows by inserting a TcpWindowSize entry into your registry. Your default packet size being set incorrectly can cause these errors. Contact the manufacturer of the software that installed the packet size modification for assistance or follow this article by Microsoft: How to reset Internet Protocol (TCP/IP).
Verify that access to ports 80 and 443 are allowed on your network.
Verify that communication to albert.apple.com or photos.apple.com is not blocked by a firewall, or other Internet security setting.
Discard the .ipsw file, open iTunes and attempt to download the update again. See the steps underAdvanced Steps > Rename, move, or delete the iOS software file (.ipsw) below for file locations.
Restore your device while connected to a different network.
Restore using a different computer.

PXI-8431 not going into receive mode with VB6

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