Westermo ODW-730-F2 User Manual download pdf (Page 9)

6651-2255

Data transport in multidrop, dual channel, Y-mode configuration

RX2

TX2

Device 1

Sending data to

device 3 on the

primary channel

Device 2

Sending data to

device 4 on the

secondary channel

Device 3

Receiving data from

device 1 on the

primary channel

Device 4

Receiving data from

device 4 on the

secondary 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

The first ODW-730 unit recieives data from communications device 1 on the RS-485

port and sends it out on optical fibre TX1 using the primary data channel.

The second ODW-730 unit receives primary channel data on optical fibre RX2. Primary

channel data is repeated out on optical fibre TX1. The second ODW-730 unit also

receives data from communications device 2 on the RS-485 port. The RS-485 data is sent

out on both optical fibres TX1 and TX2 using the secondary data channel.

The third ODW-730 unit receives both primary and secondary channel data on optical

fibre RX2. Both primary and secondary data are repeated out on optical fibre TX1, but

only the primary channel data is sent out on the RS-485 port.

The fourth ODW-730 unit receives both primary and secondary channel data on optical

fibre RX2, but only the secondary channel data is sent out on the RS-485 port.

RX2

TX2

Device 1

Receiving data from

device 3 on the

primary channel

Device 2

Receiving data from

device 4 on the

secondary channel

Device 3

Sending data to

device 1 on the

primary channel

Device 4

Sending data to

device 2 on the

secondary 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

The fourth ODW-730 unit recieives data from communications device 4 on the RS-485

port and sends it out on optical fibre TX2 using the secondary data channel.

The third ODW-730 unit receives secondary channel data on optical fibre RX1.

Secondary channel data is repeated out on optical fibre TX2. The third ODW-730 unit

also receives data from communications device 3 on the RS-485 port. The RS-485 data is

sent out on both optical fibres TX1 and TX2 using the primary data channel.

The second ODW-730 unit receives both primary and secondary channel data on optical

fibre RX1. Both primary and secondary data are repeated out on optical fibre TX2, but

only the secondary channel data is sent out on the RS-485 port.

The first ODW-730 unit receives both primary and secondary channel data on optical

fibre RX1, but only the primary channel data is sent out on the RS-485 port.

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Westermo ODW-730-F2 User Manual Page 9

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