The system structure of the bus system is not complicated. The host outputs the bus through each bus, and then accesses the bus module after each probe. The detector's defense area is triggered by the address of the module.
485+485- The data lines must be mutually twisted. Wiring must be shielded twisted pairs of multiple strands, multiple strands are for backup, shielding is to debug when there are special circumstances. Twisted is because 485 communication adopts differential mode communication principle, twisted pair has the best anti-jamming performance. The 485 bus must be a hand-in-hand bus structure and resolutely prevent star connections and bifurcated connections. The equipment-powered AC and chassis must be physically grounded and grounded. There are many places that have triangular sockets on the surface. In fact, they are not grounded at all. Be careful of this situation. When the grounding is good, it can ensure that the equipment is struck by surges and surges. When the static electricity accumulates, it can cooperate with the lightning protection design of the equipment to release energy. Protect 485 bus devices and related chips from harm. Avoid walking with strong electricity to avoid interference by strong electricity. This is a strict construction specification.
Based on this principle structure, the reliability of the bus system alarm host depends largely on the stability of the bus module and the bus signal communication. In some use cases, the bus alarm host often causes the system due to an outdoor rain. The phenomenon. After repeated field test demonstration, we found that the cause of the problem lies in the past bus module design issues. The stable transmission of the bus requires the bus to have a stable impedance value, and if the outdoor line pipe and the front-end detector are poor in water resistance, it is easy to make the rain wet to make the bus line short-circuit or the line impedance greatly change, such as the excessive number of bus modules. Will inevitably cause the bus load to be too heavy, will cause the phenomenon of occurrence of the bus line finally. This type of fault condition will restore the line impedance when the weather conditions on the site turn and the climate is dry, and the bus system will return to normal. In order to avoid such a situation, an excellent bus controller will be pre-adjusted in terms of design ideas. Considering that the power consumption of the front-end module is very small, power can be taken directly from the front-end detector to avoid overloading the bus. In order to reduce the burden of the signal bus, and at the same time to the front of the module circuit also requires the use of physical waterproof measures, so that you can ensure the long-term stability of the system.
It can be seen that a well-designed bus perimeter controller is in place. The front-end module must adopt the separation of the power supply and the bus signal, and adopt a waterproof coating circuit design. Such design ideas and manufacturing processes will surely become outdoor application bus control. A specification of the system.
485+485- The data lines must be mutually twisted. Wiring must be shielded twisted pairs of multiple strands, multiple strands are for backup, shielding is to debug when there are special circumstances. Twisted is because 485 communication adopts differential mode communication principle, twisted pair has the best anti-jamming performance. The 485 bus must be a hand-in-hand bus structure and resolutely prevent star connections and bifurcated connections. The equipment-powered AC and chassis must be physically grounded and grounded. There are many places that have triangular sockets on the surface. In fact, they are not grounded at all. Be careful of this situation. When the grounding is good, it can ensure that the equipment is struck by surges and surges. When the static electricity accumulates, it can cooperate with the lightning protection design of the equipment to release energy. Protect 485 bus devices and related chips from harm. Avoid walking with strong electricity to avoid interference by strong electricity. This is a strict construction specification.
Based on this principle structure, the reliability of the bus system alarm host depends largely on the stability of the bus module and the bus signal communication. In some use cases, the bus alarm host often causes the system due to an outdoor rain. The phenomenon. After repeated field test demonstration, we found that the cause of the problem lies in the past bus module design issues. The stable transmission of the bus requires the bus to have a stable impedance value, and if the outdoor line pipe and the front-end detector are poor in water resistance, it is easy to make the rain wet to make the bus line short-circuit or the line impedance greatly change, such as the excessive number of bus modules. Will inevitably cause the bus load to be too heavy, will cause the phenomenon of occurrence of the bus line finally. This type of fault condition will restore the line impedance when the weather conditions on the site turn and the climate is dry, and the bus system will return to normal. In order to avoid such a situation, an excellent bus controller will be pre-adjusted in terms of design ideas. Considering that the power consumption of the front-end module is very small, power can be taken directly from the front-end detector to avoid overloading the bus. In order to reduce the burden of the signal bus, and at the same time to the front of the module circuit also requires the use of physical waterproof measures, so that you can ensure the long-term stability of the system.
It can be seen that a well-designed bus perimeter controller is in place. The front-end module must adopt the separation of the power supply and the bus signal, and adopt a waterproof coating circuit design. Such design ideas and manufacturing processes will surely become outdoor application bus control. A specification of the system.