Westermo ODW-730-F1, Руководство пользователя

Страница: 18 / 20

18 6651-2241
About the interfaces
Power terminal
The power terminal has two independent inputs, +VA and +VB, allowing redundancy
should either fail. The ODW-730 power supply is galvanically isolated from all other
internal electronics.
Optical fibre interfaces
ODW-730 uses Small From Factor Pluggable (SFP) transceivers that are in compliance
with the Multi-Sourcing Agreement (MSA). This means that a wide range of different
fibre tranceivers and connectors can be used. For supported transceivers, see SFP data
sheet.
RS-485 interface
A 4 position detachable screw terminal that can handle full duplex data rates up to 1.5
Mbit/s and can be set to either 2- or 4-wire RS-485 system.
When 4-wire RS-485 is selected, the terminals T/R+ and T/R– will always be set to
transmit and terminals R+ and R– will always receive data.
Manchester coded protocol can be transferred with Synchronuous mode.
Status port
The status port connects to an internal relay wich may be used to trigger an external
alarm if a fault condition occurs. During normal operation pins 1 and 2 are in contact
with each other, and pins 2 and 3 are isolated. During an optical link failure, or power
failure, pins 1 and 2 are isolated, and pins 2 and 3 are in contact with each other.