Terminating Resistors - ECOLAB Versatronic Modbus Beschreibung

4.2.1

Terminating resistors

Optional boards for serial interfaces RS422/485 have integrated terminating resistors.
The terminating resistors can be activated and deactivated via the DIP switch next to the
connection port on the optional board. For the RS422/485 interface "COM 1" on the base
unit, terminating resistors must be installed by the customer.
Correct installation/configuration of the terminating resistors at the ends of the bus line
must be assured before commissioning an RS422/485 interface.
The following table shows the positions of the DIP switches on the RS422/485 optional
board for activating and deactivating the terminating resistors.
RS422/485 without terminating resistors (deactivated)
RS422/485 with terminating resistors (activated)
NOTICE!
Trouble-free operation requires terminating resistors at the beginning and
end of an RS422/485 transmission path.
Terminating resistors for optional boards
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Interfaces
417102397 Rev. 1-10.2019