Search Results

Search found 4049 results on 162 pages for 'serial communication'.

facebook twitter digg google delicious technorati stumbleupon myspace wordpress linkedin gmail igoogle windows live tumblr viadeo yahoo buzz yahoo mail yahoo bookmarks favorites email print

Page 25/162 | < Previous Page | 21 22 23 24 25 26 27 28 29 30 31 32  | Next Page >

  • Do USB interrupt transfers guarantee order?

    - by ulidtko
    I've found in the fairly awesome book titled "USB in a NutShell" that interrupt transfers provide reliable delivery (via error detection and automatic retry). But I wonder, does that guarantee that transfers will not be swapped in order someday? As far as the bus is serial, my guess is that yes, reordering should never occur. But I'm not really much into this, so having doubts. Could somebody clarify?

    Read the article

  • What is wrong with this attempt of sending a break-signal?

    - by Jook
    I have quite a headache about this seemingly easy task: send a break signal to my device, like the wxTerm (or any similar Terminal application) does. This signal has to be 125ms long, according to my tests and the devices specification. It should result in a specific response, but what I get is a longer response than expected, and the transmitted date is false. e.g.: what it should respond 08 00 81 00 00 01 07 00 what it does respond 08 01 0A 0C 10 40 40 07 00 7F What really boggles me is, that after I have used wxTerm to look at my available com-ports (without connecting or sending anything), my code starts to work! I can send then as many breaks as I like, I get my response right from then on. I have to reset my PC in order to try it again. What the heck is going on here?! Here is my code for a reset through a break-signal: minicom_client(boost::asio::io_service& io_service, unsigned int baud, const string& device) : active_(true), io_service_(io_service), serialPort(io_service, device) { if (!serialPort.is_open()) { cerr << "Failed to open serial port\n"; return; } boost::asio::serial_port_base::flow_control FLOW( boost::asio::serial_port_base::flow_control::hardware ); boost::asio::serial_port_base::baud_rate baud_option(baud); serialPort.set_option(FLOW); serialPort.set_option(baud_option); read_start(); std::cout << SetCommBreak(serialPort.native_handle()) << std::endl; std::cout << GetLastError() << std::endl; boost::posix_time::ptime mst1 = boost::posix_time::microsec_clock::local_time(); boost::this_thread::sleep(boost::posix_time::millisec(125)); boost::posix_time::ptime mst2 = boost::posix_time::microsec_clock::local_time(); std::cout << ClearCommBreak(serialPort.native_handle()) << std::endl; std::cout << GetLastError() << std::endl; boost::posix_time::time_duration msdiff = mst2 - mst1; std::cout << msdiff.total_milliseconds() << std::endl; } Edit: It was only necessary to look at the combo-box selection of com-ports of wxTerm - no active connection was needed to be established in order to make my code work. I am guessing, that there is some sort of initialisation missing, which is done, when wxTerm is creating the list for the serial-port combo-box.

    Read the article

  • Making a cracked or activated windows uncracked

    - by ugurcode
    I have a pc which has windows 7 license but I installed windows from an image i downloaded and it is already activated. for validating genuine microsoft, i need to entet my own product key but the necessary activation tools do not exist in my windows folder. What do? I googled stuff but because the keywords are too broad I couldn't find a useful tool DAZ doesn't work, activation button doesn't show up. When I enter my original key to Windows Anytime Upgrade, I get this error When I attempt using slmgr, I get this error I used sfc /scannow Now slmgr is existing, I entered slmgr.vbs -ipk XXXXX-XXXXX-XXXXX-XXXXX-XXXXX (replacing X es with the cd key) the operation successful. Now I have installed Microsoft Security essentials, which means the problem is solved. Main steps are here open cmd enter Enter "sfc /scannow" enter slmgr.vbs -ipk XXXXX-XXXXX-XXXXX-XXXXX-XXXXX Success

    Read the article

  • Internet is a series of tubes?

    - by Zoredache
    Almost all of use have heard of Ted Stevens trying to describe the Internet with the analogy that it is a series of tubes (mp3). I believe that it likely that some tech person somewhere tried to describe the Internet to him and this was the best analogy they could come up with. What analogy would you use to describe the Internet, and issues related to bandwidth, latency, etc, to your grandmother or someone else with no IT experience.

    Read the article

  • Satellite data in Russia?

    - by Eddy
    Anyone familiar with options for transmitting data in Russia? I'd be interested in hearing about low-speed packet data and faster. Not really looking at VSAT initially as I'd like to keep the power requirements low unless we find no other options.

    Read the article

  • How do I use a Minitel terminal as a linux dumb terminal

    - by Pawz
    I recently purchased a US version of the Alcatel Minitel terminal. I think it's a 1B version. Pictures of it here: I tried connecting a null modem to the 25 pin port on the back and plugging it into a linux box running agetty but I couldn't get it to show any signs of being connected. I used Google Translate to translate this document into English: http://mirabellug.org/wikini/upload/Documentations_minitel.pdf As far as I can tell, you take it out of videotex mode by typing Fcnt-T A, then turn off local echo with Fcnt-T E, then set it to 4800 baud with Fcnt-P 4. I presume Fcnt refers to the "CTRL" key on my terminal. But I think I'm doing something wrong, because it doesn't look like it's recognising the keystrokes, because "Fcnt-T A" just prints the letter A to the screen, which is not what you'd expect a function key combo to do. Has anyone used these minitel terminals as a linux terminal, and if so, please can you share how to configure the minitel to run as a terminal ? Is the 25 pin plug even the correct port to use ? I read something online that indicated you're supposed to use the 5 pin DIN plug instead, is that right ? If so, what's the 25 pin plug for ? If I am supposed to use the DIN plug, does anyone know the pinouts so I can make a cable ?

    Read the article

  • Can I set up a COM Port that Connects via TCP/IP?

    - by Kristopher Johnson
    I have an RS232 device connected to a Digi PortServer on my network. I can telnet to the Digi's IP and port number to communicate with that RS232 device. I have a Windows application that knows how to talk to the device, but it wants to connect directly to an RS232 port. So, my question: Is there some way to set up a COM port so that when this application connects to it, it goes through the network to the Digi to communicate with the device? I have run across the utility TCP-Com, which seems like it might be a solution. Is this the best option?

    Read the article

  • What do the numbers on Western Digital drives mean?

    - by Evan Carroll
    There are numerous numbers on a Western Digital drive, MDL (presumably model, ex WD5000BEKT-00KA9T0) -- not sure what the 99KA9T0 is. WWN (ex 50014EE25AC8C945) DCM (ex HBNTJBBB) LBA (ex 976773168) R/N (ex 77174) Then there are three numbers on the back of the PCB on a sticker White Sticker Left: 2061-771714-002 AC White Sticker Right: XT BD34 T7KQ 8 0002270 White Sticker far-Right: 272 Then there is one number printed on the PCB, REV P1 2060-771714-002 Then there is one number (or three) on the spindle, 71206-T8Y-03 9X0X22MF 32H Does anyone know what these numbers mean?

    Read the article

  • How CPU communicates with HW

    - by b-gen-jack-o-neill
    Good day. I am new here, but I could not find answer to my question using google, so I help I do not violate any rules. So, basically, all I want to ask is, how CPU comminucates with other HW, such as printers, Graphic card, sound card, LAN card etc. I know, that for basic system I/O, you can use BIOS interrupts. INT 10h I believe is for display output. But, what I would like to know is, what actually happens when you execute instruction int 10h. From desription of int instruction, it should jump to routine, which is stored on adress pointed by adress stored in iterrupt table. But how does this routine get into the RAM? Does BIOS save that routines to the RAM? And what actually that routine does? I mean, CPU can only acess RAM, right? So how can now acess some other HW? Is there some special instrucion for it? Or is CPU somehow connected to BIOS, and than BIOS actually does the work? And the last thing, does even OS like Windows or GNU/Linux use BIOS interrupts, or can OS acess HW directly? Thanks.

    Read the article

  • IIS replication - Is it possible

    - by Ian
    Hi All, I have a requirement for a client that I have a centralised system that all his satellite branches can work on. Currently this is a ASP.net web forms app running under IIS 7 on win 2008 RC 2 using an SQL backend. The client has now requested that each branch have a local server, so that in the event that the internet connection is down, the branches productivity does not suffer. His other request is that everything can be updated via the central hub and using some mechanism the updates filter down to the individual sites. What are my options here? I see the following as possible options: Multiple redundant internet connections controlled by load balancers SQL replication for the DB (What is better, snapshot, merge or transactional) Roll my own IIS sync service the periodically checks if there is a new version of the web app and downloads it (I hope there are better option than this) Something way better I don’t yet know about (I hope this is the one I need) One of my clients concerns are that the branches are often in very remote areas where everything from technicians to internet is hard to find and very scarce. Any ideas, suggestions, tips etc are welcome. Thanks all

    Read the article

  • Make 2 virtual machines ping in virtual box

    - by darkheir
    I'm trying to make 2 virtual machines communicate in Virtual Box, but whitout any success. Here are the step I have done: I setted both VMs in Internal networking mode (using VBoxManage modifyvm "VM name" --nic<x> intnet) I setted the DHCP server that is built into VirtualBox to manage IP addresses :VBoxManage dhcpserver add --netname intnet --ip 10.13.13.100 --netmask 255.255.255.0 --lowerip 10.13.13.101 --upperip 10.13.13.254 --enable But then both of the VM have the same IP Adresse (10.13.13.101) and even if set the IP manually, the Virtual Machines are not pinging each other.

    Read the article

  • How does an OS communicate with other hardware components?

    - by Jack
    How can a program running on a CPU (mostly OS) access other PC hardware? Such as Graphic card, HDD and so? From what I read, in DOS, this was done using BIOS calls, specifically the INT instruction. But, the INT instruction should only jump to the certain space in RAM. So how can some program stored in RAM access other computer hardware, when the CPU can only access RAM, and receive interrupts? Does Windows use INT instructions as well, or is there a new way to communicate with the hardware?

    Read the article

  • What is the minimum delay between two consecutive RS232 frames?

    - by Lord Loh.
    I have been working on creating a UART on an FPGA. I can successfully transmit and receive single characters typed on PuTTY. However, when I set my FPGA to constantly write a large sequences of "A", sometimes I end up with a sequences of "@" or some other characters until I reset the FPGA a few times. I believe the UART on the computer looses track of the difference between the start bit and a zero. The delay between the two "A" is ~ 30us (measured with a logic analyzer) and the baud rate is 115200 8N1. Is there a minimum delay that must be maintained between two consecutive RS232 frames?

    Read the article

  • deploying skype for 50 nationwide users with preset usernames

    - by kevyn
    Is there a way to sign up a large group of skype names at once? is there a way to enable the users to be given a skype username based on their own e-mail addresses? What I would like to do is roll out skype in an office in every county in UK with a pre defined username such as 'mycompanyname-warwickshire', 'mycompanyname-bedfordshire' and so on. Our users are only basic computer users, so I would ideally like this done with as least fuss as possible for them! Thanks in advance ps. if anyone has a good way of doing this by using any alternative software, I'm open to suggestions

    Read the article

  • How OS comunicates with HW?

    - by Jack
    Hi, how can program runnig on CPU (mostly OS) acess other PC hardware? Such as Graphic card, HDD and so? From what I read, In DOS, this was done using BIOS calls, specifically INT instruction. But, int instruction should only jump to the certain space in RAM. So, how can some program stored in RAM acess other computer HW, when CPU can acess only RAM, and reeive interrupts? And, does windows use int instructions as well, or is there any new way to communicate with HW? Thanks.

    Read the article

  • How to connect laptop with telephone using WI-FI? (ethernet)

    - by rmaster
    What I did: 1)added new wireless network in wireless network settings and gave it SSID 2)gave laptop the IP like 192.168.0.1, mask: 255.255.255.0, gateway: 192.168.0.2 3)gave the telephone with wifi the same mask but IP and gateway rewersed But telephone can not find my new wireless network(it can find all other networks), computer also can not find it. where is error? how to make it visible and working? if my steps are wrong tell me correct way to establish this connection via wi-fi

    Read the article

  • How a router decides destination of packet?

    - by user58859
    I have basic networking question. Scenario : Two pc's are communicating on a wan. Both the pc's ate behind routers or modems. My question : Both the pc's have public IP of each other. That public IP is most of the time is either of the router or of the modem. There can be more then one pc's behind those routers and modems. Then how the pc's are communicating. I can understand the packets can reach upto those routers or modems. But what after that. In the packet , destination IP is public IP. Then how the router or modem decides where to send the packet? Can anybody explain me this please. Thanks in advance.

    Read the article

  • How cpu writes data to dynamic RAM

    - by Krit
    Hello, I would like to know what kind of electrical signals does a cpu send to a dynamic RAM when it wants to write one bit (a 1 or 0). Is it simply that cpu sends just a single electric pulse, and if that electric pulse's voltage is higher than a certain level, it charges the capacitor to a voltage level that is "1" and if it is at a lower voltage band, it charges capacitor to level that it is "0"?

    Read the article

  • TCP > COM1 for receiving messages and displaying on POS display pole

    - by JakeTheSnake
    I currently have a Java Applet running on my web page that communicates to a display pole via COM1. However since the Java update I can no longer run self-signed Java Applets and I figure it would just be easier to send an AJAX request back to the server and have the server send a response to a TCP port on the computer...the computer would need a TCP COM virtual adapter. How do I install a virtual adapter to go from a TCP port to COM1? I've looked into com0com and that is just confusing as hell to me, and I don't see how to connect any ports to COM1. I've tried tcp2com but it doesn't seem to install the service in Windows 7 x64. I've tried com2tcp and the interface seems like it WOULD work (I haven't tested), but I don't want an app running on the desktop...it needs to be a service that runs in the background. So to summarize how it would work: Web page on comp1 sends AJAX request to server Server sends text response to comp1 on port 999 comp1 has virtual COM port listening on port 999, sends data to COM1 pole displays data

    Read the article

  • Sending a file to uCLinux

    - by Mike
    I have a board running uClinux, and I need to send a file to it, but I'm not sure how... I have a RS232 port, and Ethernet port with an IP address at my disposal, I can telnet to the board, but uCLinux doesn't have a built in FTP client. What sort of options do I have here for transferring files from my Windows 7 (or OpenSUSE) machine(s) to this board? EDIT I just found I have a TFTP server on it: # tftp BusyBox v0.60.5 (2012.07.09-14:05+0000) multi-call binary Usage: tftp [OPTION]... HOST [PORT] But I can't find any good information on how to use TFTP. And looking around google I'm seeing it's good for loading binary images, so I'm assume anything could be sent, but I'm not sure.

    Read the article

facebook twitter digg google delicious technorati stumbleupon myspace wordpress linkedin gmail igoogle windows live tumblr viadeo yahoo buzz yahoo mail yahoo bookmarks favorites email print

< Previous Page | 21 22 23 24 25 26 27 28 29 30 31 32  | Next Page >