1200 m or more are possible.
Modbus rtu cable.
Go back to modbus rs485 cabling rules 8.
The cable shield must be earthed only in one point.
So if you desire data fast and you want to come into the 21st century then modbus tcp ip is the way.
However the cable recommended for long lengths can be expensive so if there is an existing ethernet infrastructure in place it may be more affordable to convert from bacnet ms tp or modbus rtu over rs 485 to bacnet tcp ip or modbus tcp ip over ethernet.
Modbus has become a de facto standard communication protocol and is now a commonly available means of connecting industrial electronic devices.
The industrial rs 485 cables are designed with low capacitance ideal for long distance applications.
Normally this connection is made at one end of the main cable.
Modbus is popular in industrial environments because it is openly published and royalty free.
Under ideal conditions cable lengths of 4000 ft.
The atv212 drive includes a line termination as standard.
In environments where excessive interference.
Cable termination rs485 modbus rtu line line bias when the rs485 network is not being actively driven by a device the differential pair is more susceptible to interference and noise.
In order to avoid signal reflections a 120 ohm termination resistance must be fitted on each end of.
Modbus is a data communications protocol originally published by modicon now schneider electric in 1979 for use with its programmable logic controllers plcs.
Of slaves also depend on the data logger specification.
Set switch sw103 to term to connect the internal 120 ω termination resistor.
Modbus tcp ip is simply the modbus rtu protocol with a tcp interface that runs on ethernet.
Maximum length is 100 m 328 ft.
From power limited tray cable pltc and plenum cmp rated cable to low smoke zero halogen cable you get the ideal solution for your automation network.
The maximum length of the communication cable should be no longer than 800m recommended the maximum number of devices that can be connected over this network can be 32 for modbus rtu including the master device trackso data logger in our case apart from the network no.
Correct termination of the shield drain to a dedicated ground terminal or chassis should provide noise rejection.
