Westermo EDW-120 - Manual (Page 22)

22 6616-2211
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 200 mA @ 12 VDC
100 mA @ 24 VDC
50 mA @ 48 VDC
Rated frequency DC
Maximum inrush
current @ 10 ms 0.13 A 2 s @ 48 VDC
Power up current < 0.3 A. Sensitive power supplies need current limit >= 0.3A
Polarity Reverse polarity protected
Redundant power input Yes
Isolation to All other 2 k V
rms
Connection Detachable screw terminal
Connector size 0.2 – 2.5 mm 2 (AWG 24 – 12)
Shielded cable Not required
RS-232
Electrical specification EIA RS-232
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
Circuit type SELV
Transmission range 15 m
Isolation to Power 2 kV
rms
Ethernet 1; 1.5 kV
rms
Connection 9-pin D-sub male (DTE)
Shielded cable Not required, except when installed in Railway applications as signalling
and telecommunications apparatus and located close to rails*
Conductive housing Isolated to all other circuits
Number of ports 2 (port A and B)