Parameterĭriver Output short circuit current Limit (mA) RS485 provides half-duplex transmission on a balanced line covering distances of up to 1.2 km. That is the purpose of this brief Modbus tutorial.īelow is a table that summarizes the characteristics of the RS485 protocol. When moving from working with the ASCII protocols of RS232 devices, it is advisable to learn the differences involved with the Modbus protocol. This less expensive approach removes the requirement for any additional components to be used.ĭevices using RS485 ports usually employ the Modbus protocol. You can construct a gateway between RS232 and RS485 interfaces, but usually you will see the RS485 protocol connecting directly to USB, GSM or Ethernet ports. You can do this by using a bus terminator, moving a switch or with a small resistor screwed onto a terminal.Ĭare must be taken to ensure that the correct interface is being used as the RS485 and RS32 protocols are not completely compatible. This eliminates the need to have several interfaces available when querying multiple devices. One of the reasons that RS485 interfacing is employed in industrial settings is its ability to serve several devices attached to the same bus. The two protocols use different electric signals to enable data transmission.
#MODBUS RTU ARDUINO PROTEUS SERIAL#
RS485 is a protocol similar to RS232 that is used to implement serial data communication.
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