Interface specifications – Westermo DDW-142-EX User Manual
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6642-22521
Interface specifications
Power
Rated voltage
24 to 48 VDC
Operating voltage
19 to 60 VDC
Rated current
245 mA (405 mA) @ 24 VDC (with 500 mA USB load)
124 mA (200 mA) @ 48 VDC (with 500 mA USB load)
Rated frequency
DC
Inrush current, I²t
10.6 mA²s @ 24 VDC
24.7 mA²s @ 36 VDC
42.4 mA²s @ 48 VDC
Startup current*)
2 x Rated current
Polarity
Reverse polarity protected
Redundant power input
Yes
Isolation to
All other
Connection
Detachable screw terminal
Connector size
0.2 – 2.5 mm² (AWG 24 – 13)
Connect the unit using at least 18 AWG (0.75 mm²) wiring
Shielded cable
Not required
* External supply current capability for proper start-up.
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
Circuit type
SELV
Transmission range
15 m / 49 ft
Isolation to
Power, SHDSL, Ethernet
Galvanic connection to
USB, Console
Connection
RJ-45 according to EIA-561
Shielded cable
Recommended
Conductive housing
Yes
Number of ports
1