In the security monitoring and control project, most of the optical cables are laid by users themselves, generally G652 single-mode optical fibers. Since the system coverage is generally not large, the optical link loss of the equipment with standard (≤20KM) equipment is very plentiful. Therefore, the optical transceiver does not require excessive optical path loss, but the user often encounters no image, image jitter, and image quality. Poor issues, when the majority of problems are at the fiber pigtails, jumpers or adapters at the ends of the optical path, and rarely with the trunk light path.
Common problems include: 1) Incorrect insertion of the fiber optic connector; 2) Contamination of the fiber optic connector core (ceramic tube).
The solutions are: 1) Re-insert the movable connector or replace the fiber jumper; 2) Wipe the plug with 99.9% absolute ethanol and plug the core; 3) Use a multimeter to check the video cable of the camera to determine whether there is a video signal.
2. Optical data interface:
In order to meet the needs of security monitoring, the system equipment (matrix, hard recorder, decoder) provides RS-485 data interface. The advantage of this format of data interface is long transmission distance, strong load capacity, and can form four. Line full-duplex communication bus, any two devices on the line can achieve two-way communication, and four-wire RS-422 bus can only achieve two-way communication between the master and slave, but not between the slaves. Its disadvantage is that there is an enabler, in a three-state form, which brings instability to the communication and even "dead". If there is no communication (runaway), look for the reason from the following aspects:
1). Check if there is any control signal. Use a multimeter to exchange 10V file controller (matrix, hard record, etc.) to output RS-485 port to see if it has control signal output.
2). Judging whether the optical transceiver RS-485 interface is normal, if the UA-B voltage is zero, it is deemed as abnormal. The pan/tilt can't be controlled by turns. This phenomenon is caused by two reasons: a) The RS-485 port A+ and B- are connected reversely; b) The system impedance is seriously mismatched.
3, the optical switch
The switch signal is a TTL level pulse train, which can control the work of warning lights, alarm bells, relays, etc. The load capacity of the switch interface is measured by the current size controlled, such as the switch load capacity of the EW series optical transceiver is ≤ 1.5A.
1) The EW series optical transceiver switch interface supports the normally open button, but when the following figure is connected, the normally open and normally closed modes are all supported.
2). The switch interface can not be directly used in parallel, and it can only be accessed through the distribution circuit if necessary.
3). Some customers use the RS-485 bus to transmit the switch quantity. According to our practical experience, this method is not desirable, and it often appears that the work is for a period of time (such as 3 to 4 days) that is the phenomenon of crashes. Switching to RS-485 converter defects may be the problem.
4. Optical Transmitter's transient interference hazards and countermeasures 1). Generation of transient interference: Transient interference occurs in large inductive loads, such as switching of electrical equipment, transformers, relays, and other equipment, and in the process of lightning, it often Electrostatic induction invades the optical transceiver.
2). Hazard of transient interference: Because it interferes with high frequencies, short duration, large interference amplitude (hundreds of kilovolts), it can burn out key parts of the optical transceiver RS-485 interface chip, main chip, etc. Traces remain, especially during the thunderstorm season in summer, and this destructive power has a great impact on users, businesses and manufacturers.
3).Response measures: Although the optical transceiver manufacturer adopts various protection methods, such as bypass method (self-healing diode), absorption method (bidirectional suppression diode, etc.), isolation method (optocoupler isolation), it still cannot completely eliminate transients. The damage caused by state interference and frequent RS-485 interface damage cause great pressure on users and manufacturers.
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