Communication Ports - Unitronics UniStream Installation Manual

Communication Ports

 Turn off power before making any communications connections.
RS485
Use the RS485 port to create a multi-drop network.
The CPU-for-Panel is shipped with a 4 pin RS485
terminal block. This connector is marked with a pin
assignment that is identical to the corresponding
marking on the CPU-for-Panel.
D+
RS485
Wiring D-
SG
 Use shielded twisted-pair cable, in compliance with EIA RS485 specifications.
 When wiring each node, connect the cable shield to the functional ground point of the
RS485 terminal block.
Caution  In order to avoid ground-loops, do not connect the RS485 functional ground
terminal to the earth of the system, as it is internally connected to the HMI
panel's functional ground point.
RS485 Termination
Use the DIP switches shown in the panel diagram
on page 3 to set the RS485 termination according
to the accompanying table.
The device is shipped with both its DIP switches set
to ON; change settings if the device is not at one of
the ends of the RS485 network.
Unitronics
Tx/Rx+ (B)
Tx/Rx– (A)
Signal Ground
Functional Ground
Position
1 2
ON ON
(factory default)
OFF OFF Not Terminated
UniStream™
DIP Switch
State
Terminated
7