Westermo EDW-100 - Manual (Page 23)

23 6616-2203
Interface specifications
* To minimise the risk of interference, a shielded cable is recommended when the cable is located inside 3 m
boundary to the rails and connected to this port.
The cable shield should be properly connected (360°) to an earthing point within 1 m from this port. This earthing
point should have a low impedance connection to the conductive enclosure of the apparatus cabinet, or similar,
where the unit is built-in. This conductive enclosure should be connected to the earthing system of an installation
and may be directly connected to the protective earth.
Power LV
Rated voltage
12 to 48 VDC
Operating voltage 10 to 60 VDC
Rated current 250 mA @ 12 VDC
125 mA @ 24 VDC
63 mA @ 48 VDC
Rated frequency DC
Maximum inrush
current @ 10 ms 0.3 A²s @ 48 VDC
Polarity Reverse polarity protected
Redundant power input Yes
Isolation to All other 2 kV
rms
Connection Detachable screw terminal
Connector size 0.2 – 2.5 mm² (AWG 24 – 12)
RS-422/485
Electrical specification
EIA RS-485
2-wire or 4-wire twisted pair
Data rate 300 bit/s – 115.2 kbit/s
Data format 7 or 8 data bits, Odd, even or none parity, 1 or 2 stop bits
Protocol Transparent, optimised by packing algorithm
Retiming Not applicable
Turn around time < 3 bits
Circuit type TNV-1
Transmission range ≤ 1200 m, depending on data rate and cable type (EIA RS-485)
Settings 120 Ω termination and fail-safe biasing 680 Ω
Protection Installation Fault Tolerant (up to ±60 V)
Isolation to Power 2 kV
Ethernet 1; 1.5 k V
rms
Connection Detachable screw terminal
Connector size 0.2 – 2.5 mm² (AWG 24 – 12)
Shielded cable Not required, except when installed in Railway applications as
signalling and telecommunications apparatus and located close to
rails*
Conductive housing No