Westermo ODW-631, User Manual

Page: 9 / 24

9 6650-2241
Point-to-point communication via fibre optical network
The serial data is transferred via a fibre optic network between two ODW-631s.
This application is useful e.g. for long distance communication, where electromagnetic
interference may occur or when isolation of the electrical network is needed. The maxi-
mum optical fibre distance between two units depends on selected fibre transceiver and
fibre type. Distance up to 80 km (50 miles) are available.
Note! The bi-di transceivers must always be used in pair, see example:
TX 1310 nm RX 1310 nm
RX 1550 nm TX 1550 nm
POWER CH 1
COM +VA +VB COM
POWER CH 1
COM +VA +VB COM TX RX TX RX
Fibre optical connection
at point-to-point communication
POWER CH 1
COM +VA +VB COM
POWER CH 1
COM +VA +VB COM
TX/
RX
TX/
RX
Fibre optical connection
at point-to-point communication (Bi-di transceiver)
Bi-di transceiver, TX 1310 nm,
RX 1550 nm. Bi-di transceiver, TX 1550 nm,
RX 1310 nm.
Serial data transfer can be set in two modes:
Syncronous mode: Transfer special protocols such as Manchester coded protocol. …
See special switch settings on page 19.
Asyncronous mode: Data will be sent over the fibre optic network when a start- …
bit has been identified. The data rate and number of data bits should be set by
DIP-switches. The turning time (from sending serial RS-485 data until changing to
receive mode) is automatically calculated from the DIP-switch setting.