Westermo TD-23 - Manual (Page 11)

11 6600-2204
RS-422/485
Electrical specification
EIA RS-485
2-wire or 4-wire twisted pair
Data rate 300 bit/s – 1200 bit/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 No
Turn around time 4.2 ms (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 / Leased Line
Connection Detachable screw terminal
Connector size 0.2 – 2.5 mm² (AWG 24 – 12)
Shielded cable Not required*
RS-232
lectrical specification
EIA RS-232
Data rate 300 bit/s – 1200 bit/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 No
Transmission range 15 m
Isolation to Power / Leased Line
Connection 9-pin D-sub female (DCE)
or Detachable screw terminal (DCE)
Connector size 0.2 – 2.5 mm² (AWG 24 – 12)
Shielded cable Not required*
Conductive housing Isolated to all other housings
* Railway installation close to the rails.
For a cable located inside 3 m boundary 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 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.