Wiring Procedures - Unitronics Uni-COM UAC-CB-01RS2 Installation Manual

UAC-CB-01RS4 – RS485 module

Wiring Procedures

Use crimp terminals for wiring; use 26-12 AWG wire (0.13 mm2 –3.31 mm2).
1. Strip the wire to a length of 7±0.5mm (0.275±0.020 inches).
2. Unscrew the terminal to its widest position before inserting a wire.
3. Insert the wire completely into the terminal to ensure a proper connection.
4. Tighten enough to keep the wire from pulling free.
Use the RS485 port to create a multi-drop network.
The UAC-CB-01RS4 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 module.
RS485 Wiring
 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.
In order to avoid ground-loops, do not connect the RS485 functional ground
Caution
terminal to the earth of the system, as it is internally connected to the
controller's functional ground point.
RS485 Termination
Use the DIP switches shown in the diagram on page 2 to
set the RS485 termination according to this 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
D+ Tx/Rx+ (B)
D- Tx/Rx– (A)
SG Signal Ground
Functional Ground
Uni-COM™ CB
Position DIP Switch
1 2
ON ON Terminated
(factory default)
OFF OFF Not Terminated
State
5