Westermo ODW-730-F2 User Manual download pdf (Page 7)

6651-2255

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

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.

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Westermo ODW-730-F2 User Manual Page 7

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