RS485 (Recommended Standard 485), also known as TIA/EIA-485-A, is a standard maintained by the Electronics Industry Alliance (EIA). RS485 is similar to the RS-232 and RS-422 standards. The RS485 and RS422 standards were developed to meet the needs of electronic component designers for longer cable lengths, increased throughput and control of multiple devices.
Standards Overview:
1.) The RS232 standard is well known because of its use with the PC. It is used for point-to-point communications.
2.) The RS422 standard allows up to 10 devices to be controlled and monitored with a greatly extended range. Several interconnected machines may be connected in a master/slave configuration. Machines configured to function as slaves can communicate with the master, but not each other.
3.) The RS485 standard expanded the number of devices and provided a way to create true multipoint communications. The multidrop networks reduced the number of wires required to connect devices to the host, but also introduced a single point of failure - the cable.
Standards Overview:
1.) The RS232 standard is well known because of its use with the PC. It is used for point-to-point communications.
2.) The RS422 standard allows up to 10 devices to be controlled and monitored with a greatly extended range. Several interconnected machines may be connected in a master/slave configuration. Machines configured to function as slaves can communicate with the master, but not each other.
3.) The RS485 standard expanded the number of devices and provided a way to create true multipoint communications. The multidrop networks reduced the number of wires required to connect devices to the host, but also introduced a single point of failure - the cable.
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Last Updated: January 16, 2007
Last Updated: January 16, 2007
As more complex equipment and processes are implemented in the industry, there arises the need to leverage existing intellectual property and products. Adding wireless RS485 compatibility to legacy systems is a key benefit realized by OEMs wanting to extend their products' capabilities and market reach.
Wireless solutions are an effective means for extending product lines without drastically redesigning existing products and systems. When radio modems are used as the wireless link, existing products and systems may be extended with no disruption to existing services.
Adding a wireless RS485 device to an existing system can be very cost effective while providing the following benefits:
- Ease of use and deployment in new and legacy systems
- Extended range capabilities
- Portability
- Ease and flexibility of installation
Wireless solutions are an effective means for extending product lines without drastically redesigning existing products and systems. When radio modems are used as the wireless link, existing products and systems may be extended with no disruption to existing services.
Adding a wireless RS485 device to an existing system can be very cost effective while providing the following benefits:
- Ease of use and deployment in new and legacy systems
- Extended range capabilities
- Portability
- Ease and flexibility of installation
