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A: The Ultra-Five twisted pair cable is a twisted-pair cable for LANs recently introduced by some cable manufacturers. These vendors claim that this Super Category 5 cable can support signal transmission frequencies of 300 MHz or higher. Whether or not these Ultra-Five lines can reach the frequency specifications claimed by their manufacturers, regardless of its practical application, this is not the case:
1. The highest transmission frequency of the current LAN does not exceed 100 MHz. The relatively new Fast Ethernet, 100Base-TX, does not exceed the transmission frequency of 100 MHz. Therefore, in the near future, the actual application has not been seen yet.
2. The cable is different from the link. The cable can reach a transmission frequency of 300 MHz, but it does not mean that the link can reach such a high frequency. Because the link is composed of cables, plugs, sockets or even couplers, distribution frames. If you want to obtain a super-five link, you must ensure that all components in the link must meet the super-five criteria. It is of no practical significance only if the cable is of the Super Category 5 and the link does not reach the Super Category 5.
3. Currently, there is no way to carry out certification tests on the installed Super V-links, which means that there are currently no standards to test the actual performance of these high-speed cables in the field. Since there is no way to check whether the installed cable can achieve the performance of Category V, it is impossible to fundamentally guarantee the actual investment.
Second, the proximity of the card reader to set the distance sometimes can not read the card What is the reason?
A: The card reader is installed on the metal surface. Since the reader is an RF product, the metal pair near the rear will absorb its RF signal if it is in front of it. If the metal surface is large, it may even affect the reader's failure to read it. Cards, or card readings, attenuate considerably. In addition, the proximity of two card readers will also affect the readers, some will shorten the reading distance, and some will cause the two card readers to read the card at the same time. The solution is: try not to install on the metal plane, or to dig away the metal part of the card reader back, and keep the distance between the readers above 25cm.
Third, if the computer and card reader equipment can not communicate why?
A: The common causes are:
The 1,485 line is loose on the terminal or the mouse is bitten or short-circuited in the middle. Use a multimeter to check the line is normal or the machine is not connected to the power or not connected to the computer.
2. The serial port number set in the controller parameter in the software is incorrect. It may be that you are connected to serial port 2, and the setting is serial port one. The computer usually has two serial ports.
3. The serial port of your computer may be burned by static electricity or disabled by the operating system, so that the COM port of the computer cannot communicate. You can test whether the serial port has been damaged through other serial devices (such as a serial mouse), or replace a serial port and set the corresponding serial port parameters of the controller to try it, or you can try a new one for a computer.
4. Whether the controller's machine number parameter is correct and the number of digits is correct. Is there any other non-numeric character or space character?
5. You may need to set the baud rate for the 232/485 converter you are using. Our baud rate is 19200. The default value of the general converter is 9600.
Method of exclusion:
First observe the device communication indicator, the red light is flashing, (red light flashes that the lower computer receives the computer command signal, green flashing indicates that the lower device has a response signal to the upper device) If there is no flashing signal during the communication process Focus on the fault 1-4 fault above, if the red light is flashing but no signal is received then focus on fault 5, if the settings are correct may be
Basic knowledge of card