Five suggestions for selecting entrance video intercom doorbell controller

by Samoa Origins Samoaorigins

There are many Chinese entrance video intercom doorbell controller products on the market at present, is almost the same function, but the quality is uneven. So the product selection is particularly important for engineering contractor. So how do we choose the entrance video intercom doorbell controller? The facility stability of the entrance video intercom doorbell system function of practicality is the most important factor in evaluation of entrance video intercom doorbell controller and core standards.

Suggest one: choose and buy has crashed and self-checking circuit design of the entrance video intercom doorbell controller

If entrance video intercom doorbell controller crashes, makes users can't open the door or doesn't close the door, and brings great inconvenience to customers, but also increases the amount of maintenance engineering, and maintenance costs, entrance video intercom doorbell controller must be installed with reset function reset chip or choose the CPU, 51 series of CPU is generally not have reset function, need to add reset chip. Self-checking function at the same time, must have, if circuit because of interference or abnormal situation crash, since the launch of system can be self-checking and in an instant.

Suggestion two: 3 against lightning protection circuit design of entrance video intercom doorbell controller

Due to the lines of communication is the distribution of the entrance video intercom doorbell controller, vulnerable to lightning, so entrance video intercom doorbell controller must for lightning protection design. We suggest that first USES the level 3 of the lightning protection design; through a discharge tube will have a large current and high voltage lightning release, in through the resistance and inductance circuit to clamp down into the circuit of current and voltage. Then through high-speed discharge tube TVS to residual current and voltage in the circuit to produce damage before release at high speed. Lightning protection index for 4000 v induction lightning for 50 times without damage to equipment. Lightning protection index is high, the equipment of storm surge, and antistatic ability of the high. Some products promote themselves also have 1500 v of the lightning protection ability, have the indicators are all chip itself actually, does not have the ability to against lightning and surge.

Suggest three: registration card access to large storage capacity, offline records storage capacity is large enough, memory chips with the nonvolatile memory chips

Recommend registration card access to 20000 pieces, article 100000 of the best offline storage record, it can be suitable for the vast majority of customers to the requirement of storage capacity, convenient for attendance statistics. Be sure to use the nonvolatile memory chips, such as Flash or impact on information also is not lost when power supply drop. If the RAM + battery mode, if the batteries or loose, or hit from current information could be lost. Entrance video intercom doorbell system may fail.

Suggest four: communication circuit design should have the detection function, apply to large connected to the system requirements

Networking entrance video intercom doorbell controller usually USES the 485 industrial bus structure connected to the Internet, many manufacturers from the cost saving consideration, usually choose max485487 or 1487 chip, the chip load capacity is weak, usually maximum load capacity is 32 sets of equipment, and if the bus if there is a communication chip damage will affect the entire communications lines of communication, and can't find what controller chip is damaged. We recommend using similar max3080 high-grade communication chip and integrated circuit. The circuit has self-checking function, if the chip is damaged, the system will automatically disconnect the connection to him; make other bus control equipment normal communication.

Suggested five: application should be simple and practical, easy to operate

If the application control program, no doubt will increase the engineering training cost and time, the customer is not easy to master the operation of the software will be angry at the contractor's engineering service attitude to the collection and continuation sheet will bring bad influence. Customers don't understand, also easy to cause wrong operation to the software, practical inconvenience. So we suggest that the developer must notice when choosing entrance video intercom doorbell controller software operation is easy and convenient. The one-sided emphasis on powerful is not suitable for promotion.

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