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FAQ#073 - Which is the maximum number of digitized sensors (RS-485, Modbus), the maximum number of chains and the maximum length of cable in a RS-485 network?

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All the SISGEO digitized sensors (IPIs, Tilt-meters, RDSs, H-Level etc..) use the serial RS-485 communication protocol.

1.The maximum number of digitized sensors in a RS-485 network are 250 (theoretical)

2.The maximum number of digitized sensors chains that is possible to connect to Modbus master unit (as OMNIAlog or miniOMNIAlog) are 4.

3. About the maximum distance (with digitized sensors configured in "Always On") :

a.      max. 250m (in one chain) from the 1st digitized sensor to the last sensor (physical cable length) and:

50 digitized sensors for Tiltmeters and H-Level

70 digitized sensors for RDSBH-Profile and IPI

b.    max. 1000m from the 1st digitized sensor to Modbus master unit (as OMNIAlog or miniOMNIAlog) with a suitable cable size, cod.WE606IPDZH)

NOTE: The sum of 3A and 3B lengths can’t exceed 1000m. The compliance of points 3A and 3B, avoids the excessive voltage drop on the RS-485 line and guarantees the correct RS-485 network operation