Fire Alarm System Circuit Bus Short Circuit Handling Methods When a certain circuit bus of the fire alarm system experiences a short circuit and the current between wires is too high, the controller emits sound and light alarms, while displaying a short circuit on the LCD screen in Chinese (see the image below). The printer … Read more
Click the blue words to follow us 1. Microcontroller Parallel External Expansion System 1. Microcontroller Parallel External Expansion System External expansion is an important aspect of building a microcontroller system, which can be categorized into two types: Memory expansion and I/O expansion; There are two methods for external expansion: parallel expansion and serial expansion. 2. … Read more
In the design, application, and selection process of fire automatic alarm systems, we often pay attention to the appearance, sensitivity, stability, and intelligence level of fire detectors, as well as the performance, interface, and functions of the control panel. However, during actual engineering construction, there are some seemingly simple issues that deserve our close attention. … Read more
In the field of testing and measurement, the development of instrument bus technology has always been a major concern for engineers and scientists. From the GPIB bus introduced in the 1960s specifically for instrument control, to the widely used USB, VXI, PXI, and the latest LXI and PXI Express, the emergence of new bus technologies … Read more
Previously, we discussed the on-chip interconnect bus, but having just the bus is not enough; we also need on-chip bus protocol support. Only with the protocol can we operate the registers accurately. When it comes to on-chip bus protocols, there are many, such as the AMBA bus used by ARM, the Wishbone bus by Silicore, … Read more
1 8-Bit/16-Bit Bus Timing Analysis 1.1 8-Bit Microcontroller Bus Timing There are many 8-bit microcontrollers with external buses, such as the 51 series and AVR series. This article takes the W77E58 as an example. The W77E58 is an enhanced 51 microcontroller introduced by Winbond, with a maximum operating clock of 40 MHz. At the same … Read more
Bus System refers to all device nodes, such as zone modules and alarm devices, being connected to two communication lines. Regardless of how many devices there are, they can share these communication lines. Branch System means that all connected devices must use independent communication lines to connect to the host. For example: When an alarm … Read more
[Abstract] The 485 bus is often used in the wiring of common access control systems, but most people do not understand it. Below, the editor will discuss the 485 bus protocol and the related knowledge of the 485 bus transmission distance. 485 Bus Protocol 485 Bus Protocol When the communication distance is required to be… … Read more
CAN bus (Controller Area Network) is a serial multi-master controller area network bus, primarily designed to connect various controllers in a vehicle, enabling communication between the engine controller, transmission controller, ABS controller, body controller, instrument panel, and other controllers. The CAN bus system not only reduces the number of wiring harnesses in the vehicle, making … Read more
A certain shopping mall has set up a fire automatic alarm system, where the 2# loop bus of the fire alarm controller is shared by two fire compartments on the first floor. Fire compartment one has 30 smoke fire detectors, 10 manual fire alarm buttons, and 10 bus modules (2 inputs and 2 outputs); fire … Read more