Delta Controls DZNR-768, Installation Manual

Page: 10 / 28

Repeater configuration
Page 10 of 28 DZNR-768 Revision 1.2 Installation Guide
Document Edition 1.5
Data wires termination jumper
The segment data wires are terminated differently for MS/TP 2 WIRE and for MS/TP RJ-45.
See the corresponding section below for a description of the proper termination.
Proper termination of the network data wires ensures network stability and helps to prevent
damage to controllers during high electrical activity.
MS/TP 2 WIRE termination
The data wires at both ends of an MS/TP 2 WIRE segment must be terminated to ensure
reliable operation. The DZNR provides a built-in jumper-selectable termination for the data
wires of each segment.
For MS/TP 2 WIRE, set the jumper for the segment to the TERM position. Terminate the data
wires at the last node on the segment with a TRM-768. The following diagram shows the
proper termination for both the data wires and the shield.
RS-485 port
+
-
MS/TP 2 WIRE port
+
-
Last node
on segment
Keep stub cable length
as short as possible
GND
TRM-768
Shield
+
DZNR with TERM
jumper set to enable
built-in segment
termination
Shield is not grounded
at this end of segment
MS/TP RJ-45 termination
For MS/TP RJ-45, remove the jumper for the segment or set it to the non- TERM position.
Devices that use MS/TP RJ-45 networking include built-in distributed termination components.