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RS232 Surge Protector, With optical isolation

Country/Region china
Company Foshan Guiling Technology Co.,Ltd
Categories Low Voltage Isolator
Telephone 0757-82320250
ICP License Issued by the Chinese Ministry
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    RS232 Surge Protector, With optical isolation

    1.Why RS-232 serial port is easy to be damaged?
    Serial communication is upper machine and lower machine,or communicationbetween PC and instrument. As there is a certain distance between PC andinstrument,usually the distance is 5 meters,higher voltage will be inductive(inductivevoltage is Proportional to the distance). The PC serial port or instrumentserial port is made of ICs. Due to special workmanship of IC, the voltage-withstandingvalue is low (usually less than 20V). In case of thundering or strongelectric spark interference,the inductive voltage will be rather high.Once the voltage is beyond the max, withstanding voltage of the serialIC,the IC will be punctuated and the serial port will be damaged. Thelonger the communication cable,the higher damage rate. Many people thinkthat serial port damage is caused by thunder which hit the machine. Ifthis is correct, not only serial port will be damaged, but also the humanbeing, house...

    2.Theory and necessity of RS232 Surge Protector
    With the appearance of serial port isolator protection,the portion ofserial port that withstands high voltage is placed outside of the hostmachineif serial protector is inserted in the port on host machine,andthere is no physical connection in the circuits with the host machine.Thereis only connection by light path. High voltage will not be inductive becausethe connection portion with host machine is short. Therefore, serial portcan be protected from damage. Even though serial protector is damaged,theserial port on host machine will be not damaged,repairing is simplified.

    3.Advantages of RS232 Surge Protector
    There is no direct connection between the circuit at the front terminalwhich sustains high voltage and the circuit at the back terminal whichconnects with host machine, the reliability of protecting host machineis very good. Even though the communication cable is very bad,the hostmachine is not threatening if only the isolation voltage of the opticalcoupler is not surpassed.

    4.Disadvantages of RS232 Surge Protector
    As optical coupler is used by the serial port isolator to divide the circuitinto two parts (front part and back part),each part is powered by connectingthe pins on RS232. For serial communication between instrument and hostmachine,the isolator is connected to the host machine,the front circuitis powered by the instrument and the back circuit is powered by the hostmachine. Therefore, one Isolator protector is in tandem for one communicationcable and one terminal of equipment can be protected. When two terminalsare in tandem to the isolator,the middle part can not be powered,the circuitdoes not work. Even there is external power supply, the signal will bedistorted or delayed during the optical coupler transmission. After thetwo distortions are superimposed or delayed,the baud rate can not reach9600 BPS and the compatibility is lowered greatly. Moreover, the wiringswith power supply will be superimposed and interference the inductivevoltage, serial port isolator protector will be damaged easily. When theIsolator protector is inserted host machine, the instrument is not protected.When the Isolator protector is inserted in the instrument, the host machineis not protected. When the protector is inserted in the middle, eitherinstrument or host machine can not be protected.

    5.Characteristics of GL-RS232-1 RS232 Surge Protector
    1). Sufficient size, reasonable wiring, sufficient safety space, no wire-distributioninterference, the isolation voltage is up to the optical coupler,2500Vcan be reached,Isolator protection is more reliable;
    2). Equipped with reliable components,consumable parts such as IN4148,TC7660with low voltage withstanding value and poor surge immunity are not used.Crystal triode and FR107 parts are used for better reliability. It iswell known that the voltage withstand of common crystal triode can reach40V or above, which is 3 times of TC7660,and the voltage withstand ofFR107 can reach 1000V,current can reach 1A. 1N4148 can not compare withthem;
    3). GL-RS232-1 RS232 Surge Protector is with multi protectionfunctions. Due to the limit of space and size, many serial port isolatorsare not equipped with self-protection part,so it may be damaged by itself.GL-RS232-1 and GL-RS232-2 Serial Protectors have sufficient space to arrangethe self-protection parts. They can protection themselves while protectingothers.
    4). Good compatibility. GL-RS232-1 RS232 Surge Protectoris powered directly from TXD pin, it is fully compatible to 3-wire serialport which is made of MAX202 and MAX232 ICs. Two-direction power supplyis adopted, stability at low baud rate can be ensured.
    5). Destructive testing at AC 100V,0.5 second is passed before delivery.It can not be damaged easily in high strength EMI.
    6). 2 years warranty.

    6.Technical Specification of GL-RS232-1 RS232 Surge Protector
    1). Connection:DB9 connector at the two sides;
    2). P

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