RS-232
Electrical specification EIA/TIA-232
Data rate 1 200 bit/s – 115.2 kbit/s
Data format 7 or 8 data bits, Odd, even or none parity, 1 or 2 stop bits;
Σ 9–12 bits
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
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*
Conductive housing Isolated to all other circuits
Miscellaneous Do not connect RS-232 and RS-422 / 485 simultaneously
* 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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