Westermo EDW-100 Guia do Utilizador descarregar pdf (Página 18)

6616-2202

Interface specifications

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 0.3 A

s @ 48 VDC

current @ 10 ms

Polarity Reverse polarity protected

Redundant power input Yes

Isolation to All other 3 kV

rms

Connection Detachable screw terminal

Connector size 0.2 – 2.5 mm

(AWG 24 – 12)

Power

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 3 kV

Ethernet 1 1.5 k Vrms

Connection Detachable screw terminal

Connector size 0.2 – 2.5 mm

(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

RS-422/485

* 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.

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