一种半双工异步串行通讯收发控制系统
Automatic transmission and reception control of the RS485 bus is achieved by using a CPLD, which solves the problems of weak bus driving capability and inaccurate driving time, and provides stable and accurate transmission and reception switching and multi-channel adaptability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHINA ORDNANCE EQUIP GRP AUTOMATION RES INST CO LTD
- Filing Date
- 2023-09-25
- Publication Date
- 2026-07-17
AI Technical Summary
Existing RS485 communication transceiver control methods have weak bus driving capabilities in high-speed and long-distance scenarios, and hardware automatic control methods suffer from inaccurate driving time and excessive processor resource consumption.
The resampling, retransmission, and pulse transmission functions are implemented using a programmable logic device (CPLD). Combined with an asynchronous communication standard clock source and an RS485 bus driver, automatic switching between transmit and receive states is achieved through digital synchronous logic control, avoiding the need for additional pull-up/pull-down circuits.
It realizes automatic transmit and receive switching of RS485 bus without software intervention, improves bus driving capability, reduces processor resource consumption, ensures circuit stability and timing accuracy, and adapts to multi-channel control.
Smart Images
Figure CN117294549B_ABST