Telnet buffer issues
Hello
Modems are configured to him telemeter data to a LabView VI. The LabView VI works as expected when cable to the instruments. A modem and an internet connection now replace the electrician, so a reconfiguration of the VI was required using Telnet reads/writes instead of VISA reads/writes. Initially there was some deformations associated with the configuration of the modem, but those who have been developed. Pattern of backstory: I think I've isolated my question how do I use/configure Telnet Read.
My question: drop-outs of data and incomplete data packets. I get 25 bytes of binary data per second, easiestly considered Hex when it broadcasts in. A valid packet looks like this:
0119 81CC 4 47 884B 5722 7ECA 000D FA37 7E52 FC66 7CF7 25 0 04
where 01 begins the sequence and 04 ends the sequence. All the mess inbetween is useful for me but totally uninteresting to most sane people. Attached are two examples of code. The first, TelnetEx.vi, is a simple version of how use the Telnet Read. When I use this Setup, I think I'm buffering 25 bytes of data, then end the line each time a hex04 is observed. Too often, I receive packets that are not 25 bytes long, but end in hex04. Moreover, I could not help gold '' normal' immediate' mode with the Telnet Read - I get some sent to all data packets. (??)
So I thought if I could electrician a way to detect the package of 25 bytes of data in the buffer, then I would outwit the incomplete packets (an incomplete package causes false ears in my data as the VI is wired to look for data in a location particular byte in the data packet). An example of this attempt of poor quality is shown in TelnetEx.vi. When I apply this filter, I don't get any data. The filter is supposed to find hex01, then search for hex04, then count to see if they are 25 bytes apart and if they are, send these data to the rest of the VI because it's a package valid.
One last note: I've been tinkering with the VI and found that if I use the delay time at a sampling faster (10 Hz) that my instrument (instrument = 1 Hz) rate so less I delivered incomplete packets and sometimes there is a break which resembles an abandonment of data and then I get several packages at once. It's probably a problem of connection/packet delivery, but maybe someone has seen this before and knows a good way to deal with?
Is the buffer of Telnet Read a FIFO? Is there a more sophisticated method to check the validitiy of a packet of data that my attempt mutilated?
Thank you
~ Tristan
It's here.
Tags: NI Software
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ICMP allow all outside
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Crypto ipsec transform-set esp-SHA-ESP-3DES-3des esp-sha-hmac
Crypto ipsec transform-set ESP-DES-MD5 esp - esp-md5-hmac
Crypto ipsec transform-set ESP-AES-192-MD5 esp-aes-192 esp-md5-hmac
Crypto ipsec transform-set ESP-3DES-MD5-esp-3des esp-md5-hmac
Crypto ipsec transform-set ESP-AES-256-SHA 256 - aes - esp esp-sha-hmac
Crypto ipsec transform-set ESP-AES-192-SHA esp-aes-192 esp-sha-hmac
Crypto ipsec transform-set ESP-AES-128-MD5-esp - aes esp-md5-hmac
Crypto ipsec df - bit clear-df outdoors
card crypto outside_map 2 match address outside_cryptomap
card crypto outside_map 2 set pfs
card crypto outside_map 2 peers set x.x.x.x
card crypto outside_map 2 game of transformation-ESP-AES-128-SHA
outside_map interface card crypto outside
crypto ISAKMP allow outside
crypto ISAKMP policy 10
preshared authentication
aes encryption
sha hash
Group 5
life 86400
crypto ISAKMP policy 20
preshared authentication
3des encryption
md5 hash
Group 2
life 86400
enable client-implementation to date
Telnet timeout 5
SSH 0.0.0.0 0.0.0.0 inside
SSH 0.0.0.0 0.0.0.0 outdoors
SSH timeout 60
Console timeout 0
management-access inside
dhcpd 10.x.x.x 4.2.2.2 dns
dhcpd field pain.local
dhcpd outside auto_config
dhcpd option 156 ascii ftpservers = 10.x.x.x
dhcpd option 42 ip 208.66.175.36
!
dhcpd address 192.168.27.2 - 192.168.27.33 inside
dhcpd allow inside
!NTP-1 md5 authentication key *.
authenticate the NTP
NTP server 10.x.x.x source inside
username XXXXXXXXX XXXXXXXXXXXXXX encrypted privilege 15 password
tunnel-group 64.X.X.X type ipsec-l2l
IPSec-attributes tunnel-group 64.X.X.X
pre-shared key X
!
class-map inspection_default
match default-inspection-traffic
!
!
type of policy-card inspect dns preset_dns_map
parameters
message-length maximum 512
Policy-map global_policy
class inspection_default
inspect the preset_dns_map dns
inspect the ftp
inspect h323 h225
inspect the h323 ras
inspect the rsh
inspect the rtsp
inspect esmtp
inspect sqlnet
inspect the skinny
inspect sunrpc
inspect xdmcp
inspect the sip
inspect the netbios
inspect the tftp
!
global service-policy global_policy
context of prompt hostname
Cryptochecksum:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
: endThe party concerned to control where you are allowed to SSH in the ASA are these lines:
ssh 0.0.0.0 0.0.0.0 inside
ssh 0.0.0.0 0.0.0.0 outside
But you have generated public/private keys?
ASA (config) # crypto key generate rsa key general module 2048
--
Don't stop once you have upgraded your network! Improve the world by lending money to low-income workers:
http://www.Kiva.org/invitedBy/karsteni -
Hello
When I try to buffer a large video (youtube HD) or the even more lag - to perform a speedtest
animation for speedtest occupies about 3 images - about 4-6 seconds apart, as with youtube, he puts in buffer 2 seconds - then firefox hangs for about 12 seconds - when he comes back he is fully buffered
has raised this issue since I got new Internet (download 76mbit) and it is not my rig like youtube and speedtest.net run perfectly smooth in chrome (but I don't like chrome or the google customer support)
I already tried enabling/disabling of hardware acceleration and tried a bit of tinkering - anything else that you can suggest? (propose any adjustments-i'll try anything)
Thank you for your time
You can check the problems caused by the recent updates of Flash and try these:
- disable an eventual extension of the browser for Firefox Plugin RealPlayer Record and if installed RealPlayer update
- disable the safe_mode in Flash 11.3 and later versions
- turn off hardware acceleration in the Flash plugin
-
I use PyDAQmx with a USB-6363, but I think the question is generic to DAQmx.
I have an output buffer that I want to be able to (re) write to without starting the task output.
More specifically, I have a graphical interface and a few sliders, the user can move. Whenever the slider changes, a new set of values is loaded into the buffer output through DAQmxWriteAnalogF64. After you set the value, the user can click on a button and start the task output.
In some cases the change in cursor does not require a change in buffer size, only a change in the data. In this case, I get the compalint following DAQmx as they tried writing:
The generation is not yet started, and not enough space is available in the buffer.
Set a larger buffer, or start the generation before writing data more than content in the buffer.
Property: DAQmx_Write_RelativeTo
Value: DAQmx_Val_CurrWritePos
Property: DAQmx_Write_Offset
Corresponding value: 0
Property: DAQmx_Buf_Output_BufSize
Corresponding value: 92In other cases the change in cursor requires both change in the size of the buffer and data modification. In this case, I get the following, but only after that do a few times each time increase the size of the writing.
DAQmx writing failed because a previous writing DAQmx configured automatically the size of output buffer. The size of the buffer is equal the number of samples written by channel, so no additional data can be written before the original task.
Start the generation of before the second writing DAQmx or set true in all instances of writing DAQmx Auto Start. To gradually write to the buffer before starting the task, call DAQmx Configure an output buffer before the first writing DAQmx.
Task name: _unnamedTask<0>State code:-200547
function DAQmxWriteAnalogF64I tried to configure the output via DAQmxCfgOutputBuffer buffer (in some cases, by setting it to zero or a samples, then save again, in an attempt to clear it) but that doesn't seem to do the trick.
Of course, I can work around the problem by loading data only when the user clicks the end button, but not what I'm asking here.
Is it possible to "remake" the writing of output before you begin the task?
Thank you
Michael
Today I have no material practical to validate, but try unreserving task before writing the new buffer:
DAQmxTaskControl (taskHandle, DAQmx_Val_Task_Unreserve);
With a simulated device, he made the error go away in case the buffer is the same size. You will need to validate if the data are in fact correct, but I think it should be (unreserving I would say reset the write pointer so the old buffer are replaced with the new data).
I always get errors when you try to change the size of buffer if (on my 6351 simulated). I posted some similar mistakes about the reconfiguration of the tasks here, I guess it is possible that this issue has also been set at 9.8 (I always use 9.7.5 on this computer). If the behavior is still present in the new driver, and also appears on real hardware (not just simulated), then it seems that this is a bug of DAQmx someone at OR should be considered.
I wrote a simple LabVIEW VI that captures the error in order to help people to NOT reproduce it:
The best solution at the moment would be likely to re-create the task if you need to change the size of the buffer (or avoid writing data until you are sure what will be the size of buffer).
Best regards
0> -
Hi all
I thought that I could transfer it here because it might be a more appropriate forum. I have a bit of time pressure, so I hope someone can help me. I'm having a problem with a program that I wrote to acquire and store images from a camera to linear scan.
My camera (SUI Goodrich, 1024 pixels) is connected to a card framegrabber (PCIe-1427), which is connected via a RTSI cable to a PCI-6731 card attached to a SCC-68 (series) connector M. My goal is to drive a mirror galvanometer scanning and acquire images from the camera continuously on each scan. As the galvo scan will be the frame of an image (1024 pixels x 1024 lines).
I managed to do it (I think), as my direct purchase program works exactly as I expected. However, when I try to save the images, I noticed that for a larger number of images, the starting point of the image is shifted the same amount for each image. I'm not really sure what's going on, it seems to me that there is a delay in the use of the VI "IMAQ set up buffer" when a larger number of buffers is used, (or even 100). Is it possible that my hardware trigger does not wait for all buffers to be configured before you start to run?
I would really appreciate any idea or ideas that anyone could have on this issue.
Sincere greetings,
Gill
I fixed the problem by doing that I don't use actually 1000 stamps to save 1000 frames. Program works if the number of buffers is lowered.
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Circular buffer asynchronous read with crush
Trying to accomplish the following without success so far:
Setup a a DAQmx read buffer in a manner such that
- all cost overruns are allowed
- can read a buffer half at any time (entire buffer will not work, due to the following requirement)
- read is compared to sample the most recent, If no data was read before or not.
If I'm really asynchronous, I should get the more recent samples (which a party may or may not be 'old' or reading of the previous call) without delay at any time I choose to call it DAQmx Read. So far, I get a dleay compatible with a demi-tampons of a data value.
Play with the following parameters did me not what I was looking for. I thought that the following combination might work:
Crush the unread samples
Reading Relative to the most recent
Read size = size of buffer/2
I can do this separately without the DAQ buffer; This isn't the issue. Call it an exercise if you wish - I'm just curious to know if this can be done with the DAQmx read buffer.
I guess what I'm wondering really is if the pointer of the playback Position can be ignored.
That works very well, thank you.
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