News
Company News
Market News
Technical Info
Discount News
 
 
 
 
 
 
 
 
 
 
 
News
 
Modbus RTU, Modbus ASCII, Modbus TCP
 
From Wikipedia, the free encyclopedia

Modbus is a serial communications protocol originally published by Modicon (now Schneider Electric) in 1979 for use with its programmable logic controllers (PLCs). Simple and robust, it has since become a de factostandard communication protocol, and it is now a commonly available means of connecting industrial electronicdevices.[1] The main reasons for the use of Modbus in the industrial environment are:

  • developed with industrial applications in mind
  • openly published and royalty-free
  • easy to deploy and maintain
  • moves raw bits or words without placing many restrictions on vendors

Modbus enables communication among many (approximately 240) devices connected to the same network, for example a system that measures temperature and humidity and communicates the results to a computer. Modbus is often used to connect a supervisory computer with a remote terminal unit (RTU) in supervisory control and data acquisition (SCADA) systems. Many of the data types are named from its use in driving relays: a single-bit physical output is called a coil, and a single-bit physical input is called a discrete input or a contact.

The development and update of Modbus protocols has been managed by the Modbus Organization[2] since April 2004, when Schneider Electric transferred rights to that organization.[3] The Modbus Organization is an association of users and suppliers of Modbus compliant devices that seeks to drive the adoption and evolution of Modbus.[4]

Reading:2006 Issused Time:2014-11-21 Print Add Favorite
 
Copyright ©2008- King Pigeon Hi-Tech.Co.,Ltd. All Rights Reserved
Address: 5/F,Building F,Yusheng Industrial Park,Jiuwei,Xixiang,Bao'an District,Shenzhen,518126,China.
TEL: 0086-755-2906 3895 Ext:804 806 809