AB-6655
20
Terminator
For communication with LonTalk protocol, terminator is required to ensure the communication reliability. For bus topology, a
terminator is connected at each end of the devices on the bus (= 2 terminators for bus topology). For free topology, a terminator
is connected at any end of the devices on the bus (= 1 terminator for free topology) throughout the whole system.
IMPORTANT:
Terminator types vary depending on network topology (bus topology or free topology). Refer to the table below.
Connection for bus topology (Total wiring length: Max. 900 m)
Connect a terminator at each end of the devices on the bus (2 terminators in total) as shown in Fig. 20.
If the wiring length is 250 m or shorter, connect a terminator at one (not both) end of the devices on the bus (1 terminator in total)
as shown in Fig. 21. In this case, be sure to use a free topology terminator.
250-900 m
Max. 250 m
: Terminator Part No. DY7212A1101
: Terminator Part No. DY7212A1100
Figure 20. Terminator connection example for bus topology
Figure 21. Terminator connection example for bus topology
(Wiring length: 250-900 m)
(Wiring length: Max. 250 m)
Connection for free topology
(Total wiring length: Max. 450 m, longest wiring length between one end to another end of the devices: Max. 250 m)
Connect a terminator to any end of the devices on the bus throughout the system (1 terminator in total) as shown in Fig. 22.
: Modular branch unit Part No. DY7203A0000
: Terminator Part No. DY7212A1100
Figure 22. Terminator connection example for free topology
(Wiring length: Max. 450 m, longest wiring length between one end to another end of the devices: Max. 250 m)
Optional terminators (modular connection type)
Part number
Indication on the labels
Network topology
Applicable transceiver
DY7212A1100
FREE
Free topology
TP/FT-10 channel
DY7212A1101
BUS
Bus topology
TP/FT-10 channel
Notes:
* Separate order is required for our terminators shown above. Be sure to separately order your applicable terminator(s).
* Our optional terminators shown above are available only for a normal use. Since the channel of the onboard transceivers our devices have
is TP/FT-10, they are not available for a special use (e.g., the power supplied via communication line).
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