Westermo ODW-730-F2 - Manual (Page 7)

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Multidrop dual channel, Y-mode configuration
In dual channel mode it is possible to use two separate data streams in a single ODW-
730 network. However, all ODW-730’s must be set to the same speed and data format.
This, of course, limits the number of possible applications for a dual channel network.
In Y-mode mode an ODW-730 network will behave as a 2-wire bus. I.e. all communica-
tion devices will “hear” the data sent out by other communication devices.
RX2
TX2
End Unit
S2: 3 ON
S2: 4 OFF
S2: 3 OFF
S2: 4 ON
S2: 3 OFF
S2: 4 OFF
End Unit
S1: 3 ON
S2: 4 ON
Device 1
Communicates
with device 3 on the
primary data channel
Device 2
Communicates
with device 4 on the
secondary data channel
Device 3
Communicates
with device 1 on the
primary data channel
Device 4
Communicates
with device 2 on the
secondary data channel
TX1
RX1
RX2
TX2
TX1
RX1
RX2
TX2
RS-485 RS-485 RS-485
Fibre
pair
Fibre
pair
Fibre
pair
RS-485
TX1
RX1
RX2
TX2
TX1
RX1
PWR
FP
TD
RD
PWR
FP
TD
RD
PWR
FP
TD
RD
PWR
FP
TD
RD
Prepare the fibre optical network
• Configure all ODW-730 units for the correct speed and data format using DIP-
switches S1:1 – S1:7. Again, notice that all ODW-730’s must be set to the same
speed and data format.
• Select RS-485 2 wire and 4-wire mode using DIP-switch S2:1 (OFF = 2-wire,
ON = 4-wire).
• Enable the RS-485 termination / fail-safe if required using DIP-switches S3:1 – S3:4
(S3:1 and S3:2 = 4-wire termination, S3:3 and S3:4 = 2-wire termination)
• The first and last ODW-730 units must be configured as Multidrop end units by
setting DIP-switch S2:3 to the ON position (End units only have one fibre pair
each and must know that this is a fact).
• All ODW-730 units that are to use the primary data channel (“blue” units in the
picture above) must have DIP-switch S2:4 set to the OFF position. Units that are
to use the secondary data channel (“orange” units in the picture above) must have
DIP-switch S2:4 set to the ON position.
• Set DIP-switch S2:6 as desired. See page 34 “Status port” for more information.
• Verify that DIP-switches S1:8, S2:1, S2:2, S2:5 and S2:8 are set in the OFF position.
• Connect the fibre pairs between the units. Always connect CH 1 from one unit to
CH 2 on the next unit as shown in the picture above.
• Connect the power supply to all units and verify that all fibre links become active.
(CH 1 and CH 2 LED’s are on, FL L and FL R LED’s are off).
• Connect the communication devices to the corresponding ODW-730 unit.
• The network is now up and running.