Author: iot-en (page 129)

Recently, Chengdu High-tech Zone released the first batch of gradient cultivation enterprises in 2020. As a high-tech enterprise focusing on the research and development of Internet of Things data communication products and related overall solutions, Zongheng Intelligent Control stood out…

What is an external interrupt and the triggering mode of the external interrupt? 2020-08-17 14:39:04 Zongheng Intelligent Control 5 What is an external interrupt? Where is the data sheet? (1) One of the interrupt types supported by SoC is called…

what is interrupt 2020-08-17 14:24: 44Zongheng Intelligent Control 3 what is interrupt (1) The invention of interrupts was used to solve macro-parallel needs. Macro means looking at it as a whole, and parallel means that multiple things are completed. (2)…

What is DB9 interface 2020-08-14 10:57:29 Zongheng Intelligent Control 1 DB9 interface introduction (1) The DB9 interface is a standardized interface commonly used in the early days of serial communication. (2) Serial communication was the main means for computers to…

What is simplex and full-duplex communication? 2020-08-14 10:30:48 Zongheng Intelligent Control 3 What is simplex and full-duplex communication? Simplex means one direction, and duplex means both parties send and receive at the same time. They can only send and receive…

The difference between serial port and parallel port 2020-08-13 14:12: 14Zongheng Intelligent Control 6 serial port The serial port is also called a serial port. Compared with the transmission speed of the parallel port, the transmission speed of the serial…

What is GPRS? The full name of GPRS DTU is GPRS data transmission unit. Currently, there is no specific name in China, and there is no clear agreement. Some people also call it data transmission terminal, data collection terminal, etc.…

What is a serial port communication protocol? There are several common ones. 2020-08-11 17:55:30 Zongheng Intelligent Control 5 What is a serial communication protocol? In layman’s terms: it is the protocol transmission method used in serial communication. The explanation in…

What is serial port parallel, serial port connection 2020-08-10 18:19: 13Zongheng Intelligent Control 4 Parallel and serial interfaces (1) Serial and parallel mainly consider the number of communication lines, which is the amount of information that the sender and receiver…

The development history of communications 2020-08-06 18:10:10Zongheng Intelligent Control 3 The development history of communications (1) The earliest communication: beacon tower, beacon; letter: electronic communication (telegraph, telephone, network signal) (2) The two most important aspects of communication are information representation…

Detailed explanation of Modbus RTU protocol 2020-08-05 17:31: 44Zongheng Intelligent Control 5 MODBUS_RTU communication protocol MODBUS_RTU communication protocol (this agreement adopts master-slave question and answer method) PDM series meters/transmitters: PDM series meters/transmitters adopt a brand-new design, which revolutionizes the concept…

What are link addresses and running addresses Link address and running address: may be the same or different. For position-related code, the running address during final execution and the link address given during compilation and linking must be the same,…