Specifications

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RS-422/485 GDW-11 485
Electrical specification EIA/TIA-485 ITU V.11
2-wire or 4-wire twisted pair
Data rate 1200 bit/s – 115.2 kbit/s
Data format 7 or 8 data bits, odd, even or none parity, 1 or 2 stop bits.
9–11 bit words
Protocol Transparent
Re-timing 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
Isolation to power port 3 kV
rms 50 Hz 1 min
Protection Installation Fault Tolerant (up to ±60 V)
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.
9–11 bit words
Protocol Transparent
Re-timing Yes
Transmission range Cable length ≤ 15 m
Isolation to Power port 3 kV
rms 50 Hz 1 min
Connection 9-pin D-sub female (DCE) and Detachable screw terminal (DCE)
Connector size 0.2 – 2.5 mm
2
(AWG 24 – 12)
Shielded cable Not required*
Miscellaneous GDW-11 485
Do not connect RS-232 and RS-422/485 simultaneously
* 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 in-
terference. 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 enclosure of the apparatus cabinet, or similar, where the unit is built-in. This conduc-
tive enclosure should be connected to the earthing system of an installation and may be directly connected to the protective earth.
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