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如何正确选购门禁控制器?

发布者:admin    【2018年07月25日】

建议一:选购具备防死机和自检电路设计的门禁控制器


Recommendation 1: purchase access control device with anti crash and self checking circuit design.


如果门禁控制器死机,会使得用户打不开门或者关不了门,给客户带来极大的不方便,同时也增大了工程商的维护量和维护成本,门禁控制器必须安装复位芯片或者选用带复位功能的CPU,一般51系列的CPU是不具备复位功能的,需要加装复位芯片。同时,必须具备自检功能,如果电路因为干扰或者异常情况死机的话,系统可以自检并在瞬间进行自启动。

如何正确选购门禁控制器?

If the door control controller is dead, the user can not open the door or shut the door, and bring great inconvenience to the customer. At the same time, it also increases the maintenance and maintenance cost of the engineer. The control controller must install the reset chip or select the CPU with the reset function. The general 51 series of CPU is not equipped with the reset function. Install the reset chip. At the same time, we must have self checking function. If the circuit is crashed due to interference or abnormal conditions, the system can self check and start self in an instant.


建议二:具备三级防雷击保护电路设计的门禁控制器


Recommendation two: access control device with three level lightning protection circuit design.


由于门禁控制器的通讯线路是分布的,容易遭受感应雷的侵袭,所以门禁控制器一定要进行防雷设计。我们建议采用三级的防雷设计,先通过放电管将雷击产生的大电流和高电压释放掉,在通过电感和电阻电路钳制进入电路的电流和电压。然后通过TVS高速放电管将残余的电流和电压在其对电路产生损害前以高速释放掉。防雷指标要求4000V感应雷连续50次对设备无损害。防雷指标高,设备的防浪涌,抗静电能力都会相应的高。有些产品宣传自己也有1500V的防雷击能力,其实这个指标是所有芯片本身就具备,根本不具备防雷击和浪涌的能力。


Because the communication circuit of the access controller is distributed and vulnerable to the invasion of inductive lightning, the access controller must design lightning protection. We propose a three stage lightning protection design, which first releases the large current and high voltage produced by the lightning stroke by the discharge tube, and clamp the current and voltage into the circuit through the inductance and resistance circuit. The residual current and voltage are then released at high speed through the TVS high speed discharge tube before damage to the circuit. The lightning protection index requires 4000V 50 times of induction thunder to damage the equipment. The lightning protection index is high, and the anti surge and anti-static ability of the equipment will be correspondingly high. Some products propagandize themselves also have the ability to prevent lightning from 1500V. In fact, this indicator is all chip itself, and it does not have the ability to prevent lightning and surge at all.


建议三:注册卡权限存储量要大,脱机记录的存储量也要足够大,存储芯片需采用非易失性存储芯片


Recommendation three: registration card authority storage capacity is large, offline record storage is also large enough, storage chips need to use non-volatile memory chips.


建议注册卡权限需要达到2万张,脱机存储记录达到10万条最好,这样可以适合绝大多数客户对存储容量的要求,方便进行考勤统计。一定要采用Flash等非易失性存储芯片,掉电或者受到冲击信息也不会丢失。如果采用RAM+电池的模式,如果电池没电或者松动,或者受到电流冲击信息就有可能丢失。门禁系统就有可能会失灵。


It is suggested that the registration card authority need to reach 20 thousand, and the offline storage records reach 100 thousand best, which can suit the requirements of the vast majority of the customers' storage capacity and facilitate the attendance statistics. We must use Flash and other non-volatile memory chips, power down or impact information will not be lost. If the RAM+ battery is used, if the battery is not working or loosened, or the current will impact, the information may be lost. The access control system may fail.


建议四:应用程序应该简单实用,操作方便


Recommendation four: application program should be simple, practical and easy to operate.


如果应用控制程序,无疑会增加工程商对客户的培训成本和时间,客户不容易掌握软件的操作会迁怒于工程商的服务态度对收款和续单都会带来不好的影响.客户对软件不懂也容易引起误操作,造成实用的不方便.所以我们建议工程商选用门禁控制器时必须注重软件的操作是否简单直观便捷.片面地强调功能强大是不适合推广的。


If the control program is applied, it will undoubtedly increase the cost and time for the engineer to train the customer. It is not easy for the customer to master the operation of the software and the service attitude of the engineer will have a bad influence on the receivables and continued orders. When choosing access control devices, Cheng Yang must pay attention to whether the operation of software is simple, intuitive and convenient.


建议五:通讯电路的设计应该具备自检测功能,适用大系统联网的需求


Recommendation five: communication circuit design should have self detection function, suitable for large system interconnection needs.


门禁控制器的联网通常采用485工业总线结构联网,通常许多厂家从节约成本考虑,选用max485487或者1487芯片,这些芯片负载能力弱,通常最大负载能力是32台设备,而且如果总线中如果有一个通讯芯片损坏会影响整个通讯线路的通讯,并且无法查找到究竟是哪台控制器的芯片损坏。我们建议采用类似max3080的高档次通讯芯片及集成电路。该电路具备自检功能,如果芯片被损坏,系统会自动断开对他的连接,使得其他总线上的控制设备正常通讯。


The network of access control controllers usually uses the 485 industrial bus structure, usually many manufacturers choose max485487 or 1487 chips from cost saving. These chips are weak in load capacity and usually have the maximum load capacity of 32 devices, and if a communication chip is damaged in the bus, the entire communication line will be affected. Communication, and unable to find out which chip of the controller is damaged. We recommend the use of max3080 like high-end communications chips and integrated circuits. The circuit has self checking function. If the chip is damaged, the system will automatically disconnect its connection, so that the control devices on other buses can communicate normally.


建议六:宜选用大功率知名品牌的继电器,并且输出端有电流反馈保护


Recommendation six: suitable for high-power brand relay, and output current feedback protection.


门禁控制器的输出是由继电器控制的。控制器工作时,继电器要频繁的开合,而每次开合时都有一个瞬时电流通过。如果继电器容量太小,瞬时电流有可能超过继电器的容量,很快会损坏继电器。一般情况继电器容量应大于电锁峰值电流3倍以上,建议选用7A额定工作电流的继电器。输出端通常是接电锁等大电流的电感性设备,瞬间的通断会产生反馈电流的冲击,所以输出端宜有压敏电阻或者反向二极管等元器件予以保护。


The output of access controller is controlled by relay. When the controller works, the relay should be frequently opened and closed, and there will be a transient current passing through each opening and closing. If the capacity of the relay is too small, the instantaneous current may exceed the capacity of the relay and will soon damage the relay. In general, the capacity of the relay should be more than 3 times the peak current of the electric lock. It is recommended to use 7A relay with rated current. The output terminal is usually an electrical inductive device with a large current such as a lock. The instantaneous interruption will produce the impact of the feedback current, so the output terminal should be protected by a varistor or a reverse diode.


建议七:建议工程商找控制器的厂家或者厂家指定的代理商处购买


Recommendation seven: suggest that the manufacturer should purchase the manufacturer or manufacturer appointed by the controller.


建议八:读卡器输入电路需要防浪涌、防错接保护


Recommendation eight: reader input circuit needs surge protection and error protection.


工程商施工时,经常是带电进行接线或者调试的,可能会因为偶然的疏忽,接错读卡器的线或者不小心引起局部的短路。如果没有防浪涌和防错接保护,很容易烧毁中央处理芯片,造成整个控制器损坏失灵,需要寄回厂家维修,可能会耽误工期,提高施工成本。良好的保护可以使得即使电源接在读卡器数据端都不会烧坏电路,通过防浪涌动态电压保护可以避免因为读卡器质量问题影响到控制器的正常运行。


When the contractor is in construction, it is often charged for wiring or debugging. It may be accidental, misread the card reader line or accidentally cause a local short circuit. If there is no surge prevention and fault protection protection, it is easy to burn down the central processing chip, cause the failure of the whole controller and need to be sent back to the factory maintenance, which may delay the time of work and improve the construction cost. Good protection can make the power supply do not burn up the circuit even in the card reader data end. By preventing surge dynamic voltage protection, it can avoid the controller's normal operation because of the reader quality problem.


只有直接找厂家或者厂家指定的代理商购买才有可能或者完善强大的技术服务,完善的售后服务才有保障,并且有可靠的后续研发能力,以保证产品具有可延续性和先进性。从其他渠道购买控制器可能会有更低的价格,但技术支持和售后服务可能是不够的。


Only directly find the manufacturers or manufacturers designated agents to buy the possible or perfect strong technical services, perfect after-sales service is guaranteed, and have reliable follow-up research and development ability, to ensure that the product has continuity and advanced. Buying a controller from other sources may have a lower price, but technical support and after sales service may not be enough.


建议九:厂家需要提供权威的质量认证


Recommendation nine: manufacturers need to provide authoritative quality certification.