User`s guide

LONWORKS LPT-10 Transceiver User’s Guide 5-13
Cable Termination
A Link Power network segment requires termination for proper data transmission
performance. A total termination impedance of approximately 52Ω is required.
Free Topology Segment
In a free topology segment, only one termination is required and may be placed anywhere
on the free topology segment. The LPI-10 Link Power Interface, with jumper at "1 CPLR"
setting, provides this termination.
Doubly Terminated Bus Topology Segment
In a doubly terminated bus topology, two terminations are required, one at each end of the
bus.
1. The LPI-10 Link Power Interface, with jumper at "2 CPLR" setting, provides one
termination.
2. An RC network (figure 5.6) provides the second termination.
To Network
C1
+
R1
C2
+
C1, C2
R1
100µF, ≥50V
105Ω, 1%, 1/8W
Notes:
Observe polarity shown for C1 and C2. 1.
Figure 5.6 RC Network
Commissioning LPT-10 Transceivers
LPT-10 transceivers can be connected to any point of the twisted pair cable provided that
the total wire and power limits are not exceeded. This design makes it simple to install
both new systems and to expand existing systems. The LPT-10 transceiver is an electronic
component and the installer should exercise reasonable care when commissioning any
electronic device. For more information on commisioning a link power system and
procedures for network fault isolation, consult [1].