General interface specifications for all MRDs
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
Connection 9 pin D-sub female
Shielded cable Not required
Conductive housing Yes
Number of ports 1
Ethernet TX
Electrical specification IEEE std 802.3. 2005 Edition
Data rate 10 Mbit/s, 100 Mbit/s, manual or auto
Duplex Full or half, manual or auto
Circuit type SELV
Transmission range 100 m/328 ft
Isolation to All other
Connection RJ-45 auto MDI/MDIX
Shielded cable Not required, except when installed in Railway applications as signalling
and telecommunications apparatus and located close to rails.*
Conductive housing Ye s
Number of ports 2
* 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 (360º) 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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