Seeking distance or speed on RS-485 bus

Network designers know that the RS-485 standard has a good historical record in achieving robust and reliable communication, and has therefore become the recommended standard for multi-point differential data transmission in industrial networks. Although the RS-485 standard has withstood the test of time, as the system or other components of the network change, RS-485 transceivers are constantly evolving to meet these needs. Modern networks are usually a combination of control systems and data links, and various requirements will vary with the changes in applications.

Author: Kim Devlin-Allen

Network designers know that the RS-485 standard has a good historical record in achieving robust and reliable communication, and has therefore become the recommended standard for multi-point differential data transmission in industrial networks. Although the RS-485 standard has withstood the test of time, as the system or other components of the network change, RS-485 transceivers are constantly evolving to meet these needs. Modern networks are usually a combination of control systems and data links, and various requirements will vary with the changes in applications.

Network requirements are increasing, so many equipment manufacturers require that control channels can not only span longer distances in the network, but also send high-speed data through the network. The RS-485 bus standard supports data transmission distances of up to 4000 feet (1200 meters), but the maximum data rate cannot be achieved under the maximum cable length: the longer the cable, the slower the data rate.

For applications that require synchronous (parallel transceiver) signal timing, that is where the optional data rate can step in to save the situation. You no longer need to choose between cable length and data rate. After defining the SN65HVD01 optional data rate transceiver once, designers can find common ground between distance and speed.

Programmable logic controller (PLC) designers can use the SN65HVD01 transceiver to send control information up to 250kbps to a remote IO module within the factory that is 1200 meters away from the PLC. Some industrial networks may require more data to move between nodes in the network. The same device can support higher data rates up to 20Mbps by using the slew rate selection feature.

Seeking distance or speed on RS-485 bus

In addition, reducing the power consumption of these networks is becoming increasingly important. The extremely low standby current that can be connected to a 3.3V or 1.8V FPGA or microprocessor can not only help achieve lower system power consumption, but also reduce high-cost level shifters.

The upgrade is also very convenient. Modern transceivers are not only carefully designed to be backward compatible with basic RS-485 transceivers, but also provide greater flexibility and robustness. SN65HVD01 is one of many devices in the RS-485 transceiver product series, which supports IEC ESD protection-now it has high flexibility without compromise! If the transceiver is a car on the RS-485 bus, it can be regarded as a fast-moving sports car with hybrid power and tank-like protection functions, and it will reach the distance you need.

What makes your RS-485 system in trouble? Can the optional data rate help?

The Links:   G150XTN035 EP1C20F324I7

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