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How to connect 4 MASS-VIEW's to a RS-485 bus system Modbus

MASS-VIEW® instruments have digital communication possibilities.


  1. a point to point connection to a PC (see FAQ: How to connect MASS-VIEW® using RS-232 to a computer?) or
  2. a RS-485 bus system using Modbus. Connecting this way makes it possible to read-out all instrument on one bus with a personal computer.
The basis of the RS-485 network is the RJ-45 multiport connector RS-485. An RS-485 network will start with the red begin terminator and will end with the black end terminator. Both are sold as one RJ-45 Terminator Set.
In between are all RS-485 connection cables for MASS-VIEW and one RS-485 USB cable to connect to the PC. To connect the Plug-In PowerSupply for MASS-VIEW to the RS-485 bus, also a RS-485 connection cable for MASS-VIEW is used and there one needs the Y-Adapter cable.

On the PC side, please make sure the correct device driver is installed. This device driver will install an additional (virtual) COM-port on the PC.

The last step is to install software which acts as the master on the RS-485 bus.

In this situation, two separate power networks are shown isolated by the RJ-45 Power Isolator, only the two data lines are connected between the two networks.

MASS-VIEW 4 instruments Hookup