dnp 3 0 protocol

the class of commands.* INS (instruction Byte of the command Message) represents the instruction code.* P1 (Parameter 1) and P2 (Parameter 2) represent two additional parameters of the command.* According to different ins,p3 (Parameter 3) indicate the byte length of the command sent to the IC card or expect the maximum data length of the IC card echo response.For t=0, these bytes, together with the data se

of the preceding operations fail, search for the default route. If the default route exists, send the packet If all of them fail, discard the package. This once again proves that the IP package is unreliable. Because it does not guarantee delivery.1. 3. subnet addressing The IP address is defined as the network number + host number. However, all hosts require subnet addressing. That is to say, the host number is subdivided into subnet number + host

packet, which does not guarantee that the data will be delivered), the TTL value of the packet is reduced by 1 per router, and when the TTL of that packet becomes 0, it is automatically discarded. The maximum value of this field is 255, that is, a protocol package is also in the router through 255 times will be discarded, depending on the system, this number is not the same, generally 32 or 64,tracerouter

1. PrefaceThis time in order to solve the company app network offline demand, did an Apple launched 0 Configuration network Protocol Bonjour test, mainly in order to solve the iOS device IP acquisition, can be used before the socket broadcast to achieve, but thesimpler and more stable than Apple-launched Bonjor。Hope to be a little help to everyone, if there is any error is also welcome to point out that we

Chapter 3 _ IP Internet Protocol IP header IP protocol is the most core protocol in the TCP/IP protocol family. All TCP, UDP, ICMP, and IGMP data are transmitted in IP datagram format. The IP address provides unreliable and connectionless services. Unreliable: IP datagram ca

occurs ). When a message is sent to different recipients, SMTP sends the same message to different recipients. There is a strange syntax for mail commands and responses, and there are also Code. In the following example, we can see which actual commands and responses are used. Complete Life Orders and responses are in section 4. Commands and responses are case-insensitive. that is, commands and responses can be in uppercase, lowercase, or But this is not necessarily true for the user's mail nam

occurs ). When a message is sent to different recipients, SMTP sends the same message to different recipients. There is a strange syntax for mail commands and responses, and there are also Code. In the following example, we can see which actual commands and responses are used. Complete Life Orders and responses are in section 4. Commands and responses are case-insensitive. that is, commands and responses can be in uppercase, lowercase, or But this is not necessarily true for the user's mail nam

I. Introduction: IP is the most core protocol in the TCP/IP protocol family. All TCP, UDP, ICMP, and IGMP data are transmitted in IP datagram format. Note that the IP address is not a reliable protocol, the IP protocol does not provide a processing mechanism after the data is not transmitted-this is considered an upper

thread is busy, and the current CPUThere is also the ability to run a new thread, then open a new thread for the completion port service. If the load capacity of the current CPU is not enough, then kill the self-threading function appropriately. I thought there should be a logical branch that handles the active end of its own thread in this place of adjustment, because when the socket is closed, there are the following operations while (M_NWORKERCNT) { postqueuedcompletionstatus (m_hcompletion

. The size of each block cannot be greater than 64k.A "Done" synchronization request is sent to the target machine (ADBD) when the file transfer is complete, in which case the requested "length" is set to the last modified time of the file. The server finally returns a "OKAY" synchronous reply after receiving this request (note that not every data block is sent) (The requested "length" can be ignored regardless of the request)RECV: The purpose of this request is to retrieve a file from the

Over the past 20 years, network technology has continued to develop, from the initial X.25, frame relay, to Ethernet, FDDI, to the popular ATM, different technologies provide diverse network options. To achieve network interoperability among various types of LAN and WAN, you need to use the network protocol. The network protocol stack used by the Internet not only has low-level

Tags: oat namespace mysql type tin sign approximate dataEstablishment of the table of norms1. The expression is the concept of the field, must be named using IS_XXX, the data type is unsigned tinyint (1 means yes, 0 means no).2. Table names do not use plural nouns.3. Disable reserved words.4. Decimal type, the use of float and double is forbidden.5. The name of the table is best added to the "Business noun

the source address and destination address refers to the network card hardware address (also called MAC address), the length is 48 bits, is in the network card Factory curing.(2) Note that the data received by the network card chip (for example, dm9000a) is a long string of data as shown above, including the Ethernet frame header, the IP datagram header, the Transport Layer protocol segment header, the application layer required data.(

permission domain name to C tube, let me go to C. Then he ran to C and asked, "What is the IP address of www.baidu.com?" ", finally C on their own server on the search found that there is a corresponding IP entry, returned to tell us." And back to the Windows system kernel, the kernel returns the results to the browser, finally the browser has been taken and cached.(2) 3-time handshake initiated by TCPSo we went in. (1) After resolving the IP address

CCNA Training Course (3) -- Vlan VTP relay single-arm route generation Tree Protocol This is the third day of the CCNA training course. There are many knowledge points on this day, and the experiment content is gradually becoming more complicated.VLAN A vswitch separates the conflict domains and the broadcast domains. A vro separates the conflict domains and the broadcast domains. In a pure exchange network

than SW1 sw2= ' 9000 ') The notification TTL issues the Get response command by the maximum length of ' xx '.B. Order situation 4If the IC card receives a command Condition 4 command, after processing the data sent with C-APDU, should send back the process byte ' 61xx ', (or the status code indicating a warning or error condition, rather than SW1 sw2= ' 9000 ') notification TTL by maximum length ' xx ' issue get Response command.(3) GET Response comm

bytes.Uint16_t max_data = 0; MTU [0] = 0;MTU [1] = 0;MTU [2] = 0;MTU [3] = 0;MTU [4] = 0;MTU [5] = mstp_port-> destinationaddress;MTU [6] =

Document directory 0: stopped 0: downtime 1: single-user mode, only root for Maintenance 2: multi-user, cannot use net file system3: full multi-user 5: Graphical 4: security mode 6: restart actually, you can view/etc/rc. rc * in d *. d .. Init 0, the corresponding system will run, the program specified in/etc/rc. d/rc0.d. Let's take a look at the name. [Root @

We will discuss the implementation of the Short MMS module in the following aspects: [Short MMS] C # Short MMS module development and design (1) -- Architecture (http://www.cnblogs.com/CopyPaster/archive/2012/12/07/2806776.html)[Short MMS] C # Short MMS module development and design (2) -- configuration (http://www.cnblogs.com/CopyPaster/archive/2012/12/10/2811626.html)[Short MMS] C # Short MMS module development and design (3) --

the Request Card.1. Send the instruction limit 0 so that the card device is in the idle status;2. send command route 8. If the card device has response, it indicates that the card is sd2.0 or above;3. Send the command serial 55 + acmd41, which is used to detect whether the operating voltage of the card device meets the requirements of the host. Before sending commands such as acmd41, send the serial 55 com