Several common fault on Optical and their solutions

  The first, Optical light path problem:    Common problems are:
    1, Fiber Optic Connector inserted incorrectly;
    2, Fiber Optic Connector core (ceramic tube) were contaminated.
    The solution is:
    1, re-exchange into the active fiber optic connectors or jumpers;
    2, with 99.9% ethanol wipe plug, socket core;
    3, the video cable with a multimeter to check the camera to determine whether the video signal.

    The second, Optical data interface:
    In order to meet the needs of security monitoring, system devices (matrix, hard record, decoders) are the way to provide RS-485 data interface, data interface in this format has the advantage of long distance transmission, load capacity, and can form four wire full-duplex communication bus line can realize any two-way communication device, and four-wire RS-422 bus can only achieve the main, two-way communication between the slave, a slave. can not. The disadvantage is that there is an enable terminal, showing three-state form of communication to bring instability and even "stuck" phenomenon.    If there is not communication (control), find out the reasons from the following aspects:
    1 detects whether the control signal measured with a multimeter to AC 10V controller file (matrix, hard-recording) Output RS-485 port, to see whether the control signal output.
    2 Optical RS-485 interface to determine whether it is normal, the voltage is zero if the UA-B is not considered normal.
    Milling head can not control, this phenomenon is caused by two reasons: a) RS-485 ports A, B-reversed; b) a serious impedance mismatch system.

    The third: Optical switch
    Switch signal is TTL level pulse train, it can control lights, alarms, relays, etc., the load capacity of the interface switch to the current size of the control measure, such as the EW Series Optical switching load capacity of ≤ 1.5A.
    1.EW Series Optical switch interface supports normally open button, but the connection as shown below, then the normally open, normally closed forms are supported.
    2 switch interfaces can not be directly used in parallel, if necessary, can only be access through the distribution circuit.
    3 Some clients use RS-485 bus transfer switch, according to our experience shows that this approach is not desirable, and often there will be work for some time (eg 3 to 4 days) that the phenomenon of death. Switch to RS-485 converter making defective might be the problem.

    Fourth, Optical transient interference hazards and response
    1 transient interference generated: transient interference produced in large inductive loads such as motors, transformers, relays and other switching equipment, as well as the occurrence of lightning process, it is often the way to the invasion Optical electrostatic induction.