vom multimeter

communication fails.4. Sometimes it can communicate, sometimes it cannot communicate, some commands can communicate, and some commands cannot communicate.Provide the following suggestions and suggestions to reduce communication faults.1. We recommend that you use and purchase the 485 converter provided by the access control manufacturer or the 485 converter of the recommended brand specified by the manufacturer.2. Access Control manufacturers will perform a lot of tests on the 485 converter the

should be installed in a dry and clean room;B. The Hub should be installed on a fixed bracket;C. The fixed Hub bracket should generally be above 500mm from the ground;D. The cable to be inserted into the Hub should be fixed on the bracket or wall to prevent accidental disconnection. Transceiver Installation A. Select the position where the transceiver is installed on the crude cable. The shortest distance between the two receivers is 25 meters );B. Use a transceiver to install dedicated tools a

, the common multimeter cannot be used to check the cause of the fault. Only a dedicated cable tester can be used to check the cause. Faults often occur during Optical Cable layout, such as signal attenuation caused by excessive optical cables, excessive bending loss and compression loss caused by bending transition, compression or breakage of optical cables, poor Optical Cable fusion, joint pollution, poor joint polishing, and joint position poor con

installation process. Since no one can work correctly, we must conduct link testing to ensure that the installation of cables meets the performance and quality requirements. If no test tool is available, connection errors may occur. Common connection errors include cable label errors, open connections, and short circuits. ① In the construction of open and short circuits, problems such as lack of tools, wiring skills or wall Threading Technology will lead to open or short circuit faults. ② Rever

greater than 50 cm. It should be noted that wire or hard power cord cannot be bound. The cables are labeled according to the computer plan. Each number corresponds to a 4-core cable, and the location of the corresponding room and outlet cannot be wrong. This is the most prone to errors during implementation. Experience is that the labels at both ends are 25 cm away from the end and pasted with light-colored plastic tape. The labels are written or pasted with paper labels with a pen and then wra

number corresponds to a 4-core cable, and the location of the corresponding room and outlet cannot be wrong. This is the most prone to errors during implementation. Experience is that the labels at both ends are 25 cm away from the end and pasted with light-colored plastic tape. The labels are written or pasted with paper labels with a pen and then wrapped with transparent tape. In addition, the standby line is usually worn at a rate of 3%. The standby line is placed in the trunk channel, with

clock line according to the initialization code in step 2 to ensure that the hardware starts properly. The general practice is to start the initialization code and try to communicate with hardware to obtain readable device information, such as ID and vendor information, to check whether the device path is correct. This step needs to be measured repeatedly until there is no problem with the hardware. Otherwise, further debugging cannot be performed. The necessary tools for this step include A

Depressed, the previous writing was not saved, and I had to write it again ...... A few days ago, I wrote an article about wifi.ArticleSome WiFi driver debugging tools are introduced in detail. problems occurred during the debugging of jiangjian WiFi driver today: The rt3070 chip used by the WiFi module uses usb2. Of course, the corresponding USB driver is needed for support ...... First load the rt3070sta. Ko driver, compile the kernel, select the corresponding module, and make modu

Summary of debugging process and method of camera driver Based on the previous debugging of the camera driver, I have summarized some minor experiences: 1. Check whether the camera circuit connection is correct based on the circuit diagram; 2. Use A multimeter to measure the power supply pin of camera and check whether the power supply of camera is normal.ProgramFor power control; 3. Check the spec document of camera and check whether the pin tr

High-impedance Mode High-impedance mode is a common term in a digital circuit. It refers to an output state of a circuit. It is neither high nor low. If a high-impedance state is input into a lower-level circuit, there is no impact on the lower-level circuit, and it is the same as not connected. If you use a multimeter for testing, it may be high or low, depending on what is next to it. Essence of the high-impedance mode: When the circuit is anal

data on the output port can be entered. Therefore, you still need to have the bus control and management to access which port, and the three-state buffer of that port can be transferred to the output status. This isTypical three-state gate Application. If there are no more than two output devices online, of course, there are no three-state gates, and the line or logic is another matter. ++ High-impedance mode is a common describe in a digital circuit. It refers to a circuit.One typeOutpu

read 1.2 mm, this How to read, I have been tragic. So simply make a digital header, so that the data can be recorded.3. Embedded Intelligent InstrumentWell, the same LCD head, if you can read the voltage, the current, the device is miniaturized. began to have functional integration developed.4. Embedded Data Acquisition EquipmentBecause of the rapid development of computer, we need to analyze more data, on a multimeter, appear thin. For example, reme

below there, find yourself, Add. Add the one you just made DLL .. My name is recognition_1_0.dll .altogether added a 3 a DLL , the lack of a can not AH!!! 2 Import Namespaces3 called DLL the programThis is my first sentence: an instance of an object Dim * * As New file name . class name第二、三、五、六 Sentence: Set the input parameters of the function, my parameters are two, one is the picture img One is a number . angle.Four: Object output parametersseventh sentence: Call MATLAB of the

the flame sensor to the simulated 5 interface of Galileo according to the wiring method described in 1. Link the entire experiment.3. Experiment Principles When there is a flame approaching and there is no flame approaching, the voltage value read by the simulation port changes. The actual measurement with A multimeter shows that when there is no flame approaching, the voltage value read by the analog port is about 0.3V. When there is a flame approac

Based on our experience, we will analyze the troubleshooting ideas of the white screen on the boot screen.1. First split the shell of the LCD screen, and then check whether the screen line interface is loose or not connected. Check that the screen connection is normal.2. Turn on the power switch of the laptop, and then use a multimeter to measure whether the power supply voltage of the screen line interface is normal. If the power supply voltage is no

.2, is the self-writing tool, here are generally used in 3 ways:1) based on the Powermanager.wakelock provided by Android2) more complex, power consumption calculation =cpu consumption +wake lock consumption + data transmission consumption +gps consumption +wi-fi connection consumption3) through the ADB shell Dumpsys battery to get3, Battery-historian (Google Open source tools)Method Two: HardwareGenerally use a multimeter or power meter Agilent to te

Drive, then burning the driver with BT Drive will not open the drive --BT The chip does not reset!!! This is my guess, immediately completely power off again, originally contains bt driver can not normally open the system image of BT can open normally. Considering the previous verification results as the starting point, I re-burn the system image by pressing the "Restart key" (called Reset key on the hardware) for a system restart, and now find that it will cause a problem.BTWhy not reset when

is not by Windows The system shuts itself down. To see if your system turns on DMA mode: A. Double-click Administrative Tools, and then double-click Computer Management; B. Click System Tools, and then click Device Manager; c. Expand the IDE ATA/ATAPI controller node; D. Double-click your primary IDE controller; 2, the CPU and fan are functioning properly and are adequate for refrigeration when the CPU fan speed slows, the CPU itself will increase the temperature, in order to protect the

there are obviously very, very clearly damaged places to be targeted maintenance completed. 2nd step: Like if the motherboard does not (with the opposite) obviously very obvious damage to the traces, and then use a soft brush to clean the motherboard dust, after cleaning up the analysis of the motherboard is normal (contrary to the normal) finished. As if normal (contrary to abnormal), it is the dust caused by the failure of the complete. 3rd step: Just like if after cleaning up the dust, thi

, check the main components on the motherboard there is no burn traces, focusing on the north-South Bridge, I/O, power supply mos tube, a variety of slots. If it is found that there is obvious burns, damage, the first to be burned, damaged parts to be replaced. 2, check the motherboard on the PCB whether there are scratches, cut off, PCB burning, drop parts and other man-made failures, such as such a failure, the first to fill the line, fill the work. The main direction of observation is the ed