15
6618-2202
* Railway installation close to the rails.
For a cable located within 3 m and connected to this port, the use of shielded cable is recommended, this is
to minimise the risk of interference. The cable shield should be properly connected (360°) to an earthing point
within 1 m of this port. This earthing point should have a low impedance connection to the conductive enclo-
sure of the apparatus cabinet, or similar, where the unit is built-in. This conductive enclosure should be con-
nected to the earthing system of an installation and may be directly connected to the protective earth.
RS-422/485
Electrical specification EIA/TIA-485 ITU V.11
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.
9-12 bit words
Protocol Transparent
Retiming Yes
Turn around time <10 µs (half duplex)
Transmission range ≤ 1200 m, depending on data rate and cable type (EIA RS-485)
Settings 120 W termination and failsafe biasing 680 W
Protection Installation Fault Tolerant (up to ±60 V)
Isolation to Power port 3 kV
rms 50 Hz 1 min
PSTN Line 2 kV
rms 50 Hz 1 min
Leased Line 2 kV
rms 50 Hz 1 min
I/O 1.5 kV
rms 50 Hz 1 min
Galvanic connection to RS-232
Connection Detachable screw terminal
Connector size 0.2 – 2.5 mm
2
(AWG 24 – 12)
Shielded cable Not required*
Miscellaneous Do not connect RS-232 and RS-422/485 simultaneously
RS-232
Electrical specification EIA/TIA-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.
9-12 bit words
Protocol Transparent
Retiming Yes
Transmission range Cable length ≤ 15 m
Isolation to Power port 3 kV
rms 50 Hz 1 min
PSTN Line 2 kV
rms 50 Hz 1 min
Leased Line 2 kV
rms 50 Hz 1 min
I/O 1.5 kV
rms 50 Hz 1 min
Galvanic connection to RS-485
Connection 9-pin D-sub female (DCE)
and Detachable screw terminal (DCE )
Connector size Detachable screw terminal 0.2 – 2.5 mm
2
(AWG 24 – 12)
Shielded cable Not required*
Miscellaneous Do not connect RS-232 and RS-422/485 simultaneously
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