Experimental Physics and
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Maybe the reason for the nQueue being 5 is because there are multiple PVs associated with each device.
These are RS-485 temperature controllers that are connected to a moxa. I am not sure if "noise" is the correct word but some of these devices seem to be prone to sending random characters at times. For some of these devices changing the cabling seems to help.
Other times it seems to be the device itself.
From: Mark Rivers <rivers at cars.uchicago.edu>
Sent: Monday, April 6, 2020 7:35:29 PM To: Sobhani, Bayan <bsobhani at bnl.gov> Cc: tech-talk <tech-talk at aps.anl.gov> Subject: RE: StreamDevice, prevent records from getting "stuck" Note that asynReport said "nQueued 5". That suggests the port was busy while 5 more I/O requests were queued up.
This looks like a device that is not responding. Your original message said `sometimes when the signal is noisy, the PV gets "stuck"` What do you mean by "signal is noisy". The TCP messages should not be "noisy". Mark -----Original Message----- From: Sobhani, Bayan <bsobhani at bnl.gov> Sent: Monday, April 6, 2020 5:57 PM To: Mark Rivers <rivers at cars.uchicago.edu> Cc: tech-talk <tech-talk at aps.anl.gov> Subject: RE: StreamDevice, prevent records from getting "stuck" The command I use to configure the port is drvAsynIPPortConfigure. For some reason I had some trouble reproducing the problems but after a few IOC restarts I got the PVs stuck again. asynReport 10 PortName gives the following: c3-tsrv1-p16 multiDevice:No canBlock:Yes autoConnect:Yes enabled:Yes connected:Yes numberConnects 1 nDevices 0 nQueued 5 blocked:No asynManagerLock:No synchronousLock:Yes exceptionActive:No exceptionUsers 1 exceptionNotifys 0 traceMask:0x1 traceIOMask:0x0 traceInfoMask:0x1 interposeInterfaceList asynOctet pinterface 0x7f3dff3a9a40 drvPvt 0xe99ad0 interfaceList asynCommon pinterface 0x7f3dff3a6d20 drvPvt 0xe98bc0 asynOctet pinterface 0xe98ca8 drvPvt 0xe98bc0 Port 10.17.2.60:4016: Connected fd: 5 Characters written: 117 Characters read: 227 After running this, a few seconds later I got the message: "2020/04/06 18:45:23.072801 c3-tsrv1-p16 XF:17ID-CT{RG:C3}T:1-SP: Timeout after reading 176 bytes "...<ff><ff><ff><ff><ff><ff><ff><ff><ff><ff><ff><ff><ff><ff><ff><ff><ff><ff><ff><ff>"" And then the PV started reading data again. I am not sure if the asynReport command is somehow fixing this or if it is just a coincidence. Alex -----Original Message----- From: Mark Rivers <rivers at cars.uchicago.edu> Sent: Monday, April 6, 2020 6:10 PM To: Sobhani, Bayan <bsobhani at bnl.gov> Cc: tech-talk <tech-talk at aps.anl.gov> Subject: Re: StreamDevice, prevent records from getting "stuck" What asyn driver are you using (drvAsynIPPort, drvAsynSerialPort, etc.)? You should run the following to see if the problem is in the asyn driver asynReport 10 PortName where PortName is the name of the asyn port. That will tell you if the port is connected, etc. Mark ________________________________ From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Sobhani, Bayan via Tech-talk <tech-talk at aps.anl.gov> Sent: Monday, April 6, 2020 4:57 PM To: tech-talk at aps.anl.gov Subject: StreamDevice, prevent records from getting "stuck" For StreamDevice I notice that sometimes when the signal is noisy, the PV gets "stuck" if it makes one too many failed requests to the device. Getting "stuck" means that no matter how many times I process the PV with a StreamDevice OUT field, it does not seem to attempt to send anything to the device until I restart the IOC. I see no technical reason why this must happen so I think this is probably something intentional in StreamDevice. Can I turn this off? I want the PV to always try to send a signal to the device, and if it can't I want to see the red letters saying there was a mismatch. Is there any way to prevent the PVs from getting "stuck"? Alex
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ANJ, 14 Apr 2020 |
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