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                    RS485 interface Location:Home - Solution
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                  RS232 / RS485 interface protection scheme


                  一、Applications:
                  1. The RS485/232 walk line is very long, easy to overpressure phenomenon
                  2. RS485/232 walk line outside, vulnerable to lightning strike
                  3. The RS485/232 walk line are susceptible to other line interference

                  二、 The scheme and matters needing attention:
                  1. The front end USES the large flow of GDT, leakage current.
                  2. The back-end using fast response time, TVS, low residual, effectively protect the RS485/232 chip.
                  3. The middle is PTC back lotus root, make the front GDT easier to action, to discharge current.
                  4. This solution meet IEC61000-4-2, GBT17626.2 standard, such as electrostatic IEC61000-4-5, GBT17626.5 surge standard, etc.
                  5. This scheme in differential mode and common mode adopts the same TVS and GDT, no dead Angle.
                  6. Mu S by 10/700 (equivalent 40 ohm internal resistance), 1.2/50-8/20 mu S test, concrete protection grade needs reference flow GDT and TVS.

                  三、 Project application:
                  1. The surveillance/security systems
                  2. The entrance guard system
                  3. The railway signal lamp control
                  4..Intelligent transportation system
                  5. Meters/meter, instruments and meters
                  6. Optical transceiver








                   
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