AB-6569
13
Terminator
For 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. 27.
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. 29. In this case, be sure to use a free topology terminator.
: Terminator Part No. DY7212A1101
: Terminator Part No. DY7212A1100
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. 29.
: Modular branch unit Part No. DY7203A0000
: Terminator Part No. DY7212A1100
Figure 29. Terminal 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)
Terminators (modular connection type) part numbers
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 the terminators shown above. Be sure to separately order your applicable terminator(s).
The terminators shown above are applicable only to a normal use. Since the channel of the transceivers provided in the devices is TP/FT-10,
they are not applicable to a special use (e.g., the same bus is used for both communication and power supply).
Branch
Branch
Branch
Branch
Branch
250-900 m
Max. 250 m
Figure 27. Terminator connection example for bus topology
(Wiring length: 250-900 m)
Figure 28. Terminator connection example for bus topology
(Wiring length: Max. 250 m)
