Westermo ODW-730-F2 - Manual (Page 4)

4 6651-2255
Data transport in multidrop, Y-mode configuration
RX2
TX2
Device 1
Sending
Device 2
Receiving
Device 3
Receiving
Device n
Receiving
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
Data from comminication device 1 is received at the ODW-730 RS-485 port (as indi-
cated by the TD LED), data bits are retimed according to the preset rate and sent out
on the optical fibre TX1. The next ODW-730 unit receives data at optical fibre RX2
(as indicated by the RD LED), and data is sent out on the RS-485 port. Data is also
repeated out on TX1 on to the next ODW-730 unit.
RX2
TX2
Device 1
Receiving
Device 2
Receiving
Device 3
Sending
Device n
Receiving
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
Data from some other communication device, for example device 3, is processed in the
same way and sent out on both optical fibres TX1 and TX2.