Some misunderstandings of choosing access controllers: Importing access controllers will be better
Imported controllers are very good in terms of product stability and maturity. However, they are expensive, and due to geographical disparity, the timeliness of services will not be good, and the cost of services will be high. At the same time, due to cultural differences, The requirements and requirements of foreign users for access control and management are different from those of China. Many functions are not suitable for China's national conditions and the needs of Chinese users. Of course, many Chinese access controller manufacturers have small production scale and weak design capabilities. There are few application cases, and contractors are advised to choose carefully. Many Chinese access controller manufacturers sell fraudulent products under the guise of Taiwan, the United States, Canada, and other countries in order to sell their products. In fact, product quality has a lot of problems. Businesses should also be cautious.
Misunderstanding 2: The reader's compatibility is as wide as possible
Some controllers claim to be compatible with readers of various formats, such as the 485 format WIEC format readers such as wiegand3740. In fact, it is not necessary. Although these formats have certain advantages in local areas, they do not conform to international standards. In the future, upgrading and capacity expansion and anti-jamming have brought troubles. We adhere to the principle of practical stability and compliance with standards. It is recommended that you only need a card reader that complies with the international standards of wiegand26bit. 90% of the imported access controllers are in compliance. This standard.
Misunderstanding 3: The stronger the function, the better
Many domestic controllers advertise how powerful their products are, and they exaggerate the function of functions on the access control. Actually, it is the most important for the stable access control and the simple and practical function. We recommend that you shield the powerful extension function and the customer needs. it offers to meet their needs, some customers do not function should not be recommended to customers, thus making the cost of training and maintenance costs reduced, it is also desirable customers with <br> <br> Myth: the more expensive price The better, or the cheaper the better
A good and cost-effective product is the best product. Your product may be because his output is not high, or the cost of advertising is too high, not necessarily a high value of the product. Cheaper products may also be one-sided manufacturers The pursuit of low cost, reduced investment in protection circuits, or the use of inferior and second-hand chips. Therefore, the contractor must keep his eyes open to make a reasonable assessment of the product's performance-to-price ratio.
The access controller's network is usually networked using 485 industrial bus structure. Usually, many manufacturers choose max485487 or 1487 chips for cost saving. These chips have weak load capacity, usually the maximum load capacity is 32 devices, and if there is a communication in the bus Damage to the chip will affect the communication of the entire communication line, and it is impossible to find out which controller chip is damaged. We recommend using high-end communications chips and integrated circuits similar to the MAX3080. The circuit has a self-check function. If the chip is damaged, the system will automatically disconnect the connection to the control device so that other control devices on the bus can communicate normally.
Choose the access controller's suggestion
The access controller is the core part of the access control system and is the soul of the access control system. The quality and performance of the access controller directly affect the stability of the access control system. The stability of the system will directly affect the work and life order of the users of the access control system, and even affect the safety of life and property.
At present, there are many door access controllers on the Chinese market, and the functions are almost the same, but the quality is uneven. Therefore, the selection of products is particularly important for the engineering company. So how do you choose a high quality access controller? The practicality of the convenience function of the stability operation of the access control system is an important factor and a core criterion for the evaluation of the access controller.
Recommendation one: Choose the access controller with anti-crash and self-test circuit design
If the access controller crashes, it will make the user unable to open the door or close the door, causing great inconvenience to the customer. At the same time, it also increases the maintenance and maintenance costs of the engineering company. The access controller must install a reset chip or select CPUs with reset function, generally the 51 series CPUs do not have a reset function, and a reset chip is required. At the same time, it must have a self-test function. If the circuit crashes due to interference or abnormal conditions, the system can self-check and perform self-start in an instant.
Recommendation 2: Access controller with three levels of lightning protection circuit design
Because the communication circuit of the access controller is distributed and vulnerable to inductive lightning, the access controller must be designed for lightning protection. We propose to adopt three-level lightning protection design. First, the large current and high voltage generated by the lightning strike are discharged through the discharge tube, and the current and voltage entering the circuit are clamped through the inductor and the resistance circuit. The TVS high-speed discharge tube then releases the residual current and voltage at high speed before it damages the circuit. The lightning protection index requires 4000V induction lightning to have no damage to the equipment for 50 consecutive times. The lightning protection index is high, and the anti-surge and anti-static capabilities of the equipment are correspondingly high. Some products advertise that they also have a 1500V lightning protection capability. In fact, this indicator is available on all chips and does not have the ability to prevent lightning and surge.
Recommendation 3: The storage capacity of registered cards must be large, and the storage capacity of off-line recording should be large enough. Non-volatile memory chips must be used for memory chips.
It is recommended that the number of registered card rights need to reach 20,000, and the number of offline storage records should be 100,000. This can be suitable for the vast majority of customers' requirements for storage capacity, facilitating attendance statistics. Must use Flash and other non-volatile memory chips, power down or shock information will not be lost. If the RAM+ battery mode is used, information may be lost if the battery is dead or loose, or if there is current shock. The access control system may fail.
Recommendation 4: The design of the communication circuit should have self-detection function, and the requirements for large-scale system networking should be recommended. 5. The application program should be simple and practical and easy to operate.
If the application of the control program, will undoubtedly increase the engineering company's training costs and time for customers, the customer is not easy to master the software operation will be angry with the engineering service attitude will have a bad influence on the collection and renewal of the customer. Do not understand it is also easy to cause misuse, resulting in practical inconvenience. Therefore, we suggest that when the project engineer chooses the access controller, it must pay attention to whether the software operation is simple and intuitive and convenient. One-sided emphasis on powerful is not suitable for promotion.
Recommendation 6: It is recommended to use high-power, well-known brands of relays with current feedback protection at the output
The output of the access controller is controlled by the relay. When the controller is working, the relay should be opened and closed frequently, and each moment of opening and closing has a transient current through. If the relay capacity is too small, the instantaneous current may exceed the capacity of the relay and the relay will be damaged shortly. In general, the relay capacity should be more than 3 times the peak current of the electric lock. It is recommended to use a relay with a rated working current of 7A. The output terminal is usually an inductive device with large current such as an electric lock. The momentary on-off will produce the impact of the feedback current, so The output should be protected by varistors or reverse diodes.
Recommendation 7: Reader input circuit needs surge protection and misconnection protection
When the contractor works, it is often live with wiring or debugging. It may be accidental inadvertently picking up the wrong line of the reader or inadvertently causing a local short circuit. If there is no surge protection and misconnection protection, it is easy to burn. The central processing chip causes the entire controller to malfunction and needs to be sent back to the manufacturer for repair. This may delay the construction period and increase the construction cost. Good protection can prevent the circuit from being damaged even if the power supply is connected to the data terminal of the card reader. Dynamic voltage protection can avoid the normal operation of the controller because of the quality of the reader.
Recommendation No. 8: It is recommended that the construction company find the controller manufacturer or the manufacturer's designated agent to purchase
Only by directly looking for manufacturers or agents designated by the manufacturer to purchase or improve a strong technical service, perfect after-sales service is guaranteed, and a reliable follow-up research and development capabilities to ensure product continuity and advanced. Buying controllers from other sources may have lower prices, but technical support and after-sales services may not be enough.
Recommendation 9: Manufacturers need to provide authoritative quality certification
Manufacturers need to provide authoritative ISO9001 quality certification certificates and product inspection reports of government quality regulatory agencies. And pay attention to verify the authenticity of these documents. There are corresponding third-party certification and the quality of the products under supervision will be guaranteed.
Imported controllers are very good in terms of product stability and maturity. However, they are expensive, and due to geographical disparity, the timeliness of services will not be good, and the cost of services will be high. At the same time, due to cultural differences, The requirements and requirements of foreign users for access control and management are different from those of China. Many functions are not suitable for China's national conditions and the needs of Chinese users. Of course, many Chinese access controller manufacturers have small production scale and weak design capabilities. There are few application cases, and contractors are advised to choose carefully. Many Chinese access controller manufacturers sell fraudulent products under the guise of Taiwan, the United States, Canada, and other countries in order to sell their products. In fact, product quality has a lot of problems. Businesses should also be cautious.
Misunderstanding 2: The reader's compatibility is as wide as possible
Some controllers claim to be compatible with readers of various formats, such as the 485 format WIEC format readers such as wiegand3740. In fact, it is not necessary. Although these formats have certain advantages in local areas, they do not conform to international standards. In the future, upgrading and capacity expansion and anti-jamming have brought troubles. We adhere to the principle of practical stability and compliance with standards. It is recommended that you only need a card reader that complies with the international standards of wiegand26bit. 90% of the imported access controllers are in compliance. This standard.
Misunderstanding 3: The stronger the function, the better
Many domestic controllers advertise how powerful their products are, and they exaggerate the function of functions on the access control. Actually, it is the most important for the stable access control and the simple and practical function. We recommend that you shield the powerful extension function and the customer needs. it offers to meet their needs, some customers do not function should not be recommended to customers, thus making the cost of training and maintenance costs reduced, it is also desirable customers with <br> <br> Myth: the more expensive price The better, or the cheaper the better
A good and cost-effective product is the best product. Your product may be because his output is not high, or the cost of advertising is too high, not necessarily a high value of the product. Cheaper products may also be one-sided manufacturers The pursuit of low cost, reduced investment in protection circuits, or the use of inferior and second-hand chips. Therefore, the contractor must keep his eyes open to make a reasonable assessment of the product's performance-to-price ratio.
The access controller's network is usually networked using 485 industrial bus structure. Usually, many manufacturers choose max485487 or 1487 chips for cost saving. These chips have weak load capacity, usually the maximum load capacity is 32 devices, and if there is a communication in the bus Damage to the chip will affect the communication of the entire communication line, and it is impossible to find out which controller chip is damaged. We recommend using high-end communications chips and integrated circuits similar to the MAX3080. The circuit has a self-check function. If the chip is damaged, the system will automatically disconnect the connection to the control device so that other control devices on the bus can communicate normally.
Choose the access controller's suggestion
The access controller is the core part of the access control system and is the soul of the access control system. The quality and performance of the access controller directly affect the stability of the access control system. The stability of the system will directly affect the work and life order of the users of the access control system, and even affect the safety of life and property.
At present, there are many door access controllers on the Chinese market, and the functions are almost the same, but the quality is uneven. Therefore, the selection of products is particularly important for the engineering company. So how do you choose a high quality access controller? The practicality of the convenience function of the stability operation of the access control system is an important factor and a core criterion for the evaluation of the access controller.
Recommendation one: Choose the access controller with anti-crash and self-test circuit design
If the access controller crashes, it will make the user unable to open the door or close the door, causing great inconvenience to the customer. At the same time, it also increases the maintenance and maintenance costs of the engineering company. The access controller must install a reset chip or select CPUs with reset function, generally the 51 series CPUs do not have a reset function, and a reset chip is required. At the same time, it must have a self-test function. If the circuit crashes due to interference or abnormal conditions, the system can self-check and perform self-start in an instant.
Recommendation 2: Access controller with three levels of lightning protection circuit design
Because the communication circuit of the access controller is distributed and vulnerable to inductive lightning, the access controller must be designed for lightning protection. We propose to adopt three-level lightning protection design. First, the large current and high voltage generated by the lightning strike are discharged through the discharge tube, and the current and voltage entering the circuit are clamped through the inductor and the resistance circuit. The TVS high-speed discharge tube then releases the residual current and voltage at high speed before it damages the circuit. The lightning protection index requires 4000V induction lightning to have no damage to the equipment for 50 consecutive times. The lightning protection index is high, and the anti-surge and anti-static capabilities of the equipment are correspondingly high. Some products advertise that they also have a 1500V lightning protection capability. In fact, this indicator is available on all chips and does not have the ability to prevent lightning and surge.
Recommendation 3: The storage capacity of registered cards must be large, and the storage capacity of off-line recording should be large enough. Non-volatile memory chips must be used for memory chips.
It is recommended that the number of registered card rights need to reach 20,000, and the number of offline storage records should be 100,000. This can be suitable for the vast majority of customers' requirements for storage capacity, facilitating attendance statistics. Must use Flash and other non-volatile memory chips, power down or shock information will not be lost. If the RAM+ battery mode is used, information may be lost if the battery is dead or loose, or if there is current shock. The access control system may fail.
Recommendation 4: The design of the communication circuit should have self-detection function, and the requirements for large-scale system networking should be recommended. 5. The application program should be simple and practical and easy to operate.
If the application of the control program, will undoubtedly increase the engineering company's training costs and time for customers, the customer is not easy to master the software operation will be angry with the engineering service attitude will have a bad influence on the collection and renewal of the customer. Do not understand it is also easy to cause misuse, resulting in practical inconvenience. Therefore, we suggest that when the project engineer chooses the access controller, it must pay attention to whether the software operation is simple and intuitive and convenient. One-sided emphasis on powerful is not suitable for promotion.
Recommendation 6: It is recommended to use high-power, well-known brands of relays with current feedback protection at the output
The output of the access controller is controlled by the relay. When the controller is working, the relay should be opened and closed frequently, and each moment of opening and closing has a transient current through. If the relay capacity is too small, the instantaneous current may exceed the capacity of the relay and the relay will be damaged shortly. In general, the relay capacity should be more than 3 times the peak current of the electric lock. It is recommended to use a relay with a rated working current of 7A. The output terminal is usually an inductive device with large current such as an electric lock. The momentary on-off will produce the impact of the feedback current, so The output should be protected by varistors or reverse diodes.
Recommendation 7: Reader input circuit needs surge protection and misconnection protection
When the contractor works, it is often live with wiring or debugging. It may be accidental inadvertently picking up the wrong line of the reader or inadvertently causing a local short circuit. If there is no surge protection and misconnection protection, it is easy to burn. The central processing chip causes the entire controller to malfunction and needs to be sent back to the manufacturer for repair. This may delay the construction period and increase the construction cost. Good protection can prevent the circuit from being damaged even if the power supply is connected to the data terminal of the card reader. Dynamic voltage protection can avoid the normal operation of the controller because of the quality of the reader.
Recommendation No. 8: It is recommended that the construction company find the controller manufacturer or the manufacturer's designated agent to purchase
Only by directly looking for manufacturers or agents designated by the manufacturer to purchase or improve a strong technical service, perfect after-sales service is guaranteed, and a reliable follow-up research and development capabilities to ensure product continuity and advanced. Buying controllers from other sources may have lower prices, but technical support and after-sales services may not be enough.
Recommendation 9: Manufacturers need to provide authoritative quality certification
Manufacturers need to provide authoritative ISO9001 quality certification certificates and product inspection reports of government quality regulatory agencies. And pay attention to verify the authenticity of these documents. There are corresponding third-party certification and the quality of the products under supervision will be guaranteed.
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