Westermo TR-36 - Manual (Page 9)

9 6614-2202
Leased Line (LL)
Electrical specification 2- or 4-wire Leased Line
Data rate 300 bit/s to 33.6 kbit/s
Protocol B103, B212, V21, V22, V22B, V23C, V23HDX, V23FDX, V32,
V32B, V34
Transmission range/ Budget PSTN 30 dB
Leased line 40 dB
Protection Installation Fault Tolerant (up to ±60 V)
Isolation to Power port
PSTN line
RS-232
RS-485 3 kV rms 50 Hz 1 min
2 kV rms 50 Hz 1 min
2 kV
rms
50 Hz 1 min
2 kV rms 50 Hz 1 min
Connection Detachable screw terminal
Shielded cable Not required
RS-422/485
Electrical specification EIA/TIA-485 ITU V.11 2-wire or 4-wire twisted pair
Data rate 300 bit/s to 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
Turn around time <10 μs (half duplex)
Transmission range 1200 m, depending on data rate and cable type (EIA RS-485)
Settings 120 Ω termination and failsafe biasing 680 Ω
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
Connection Detachable screw terminal
Shielded cable Not required*
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 earth-
ing 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.