Woodward 505HT, Installation And Operation Manual

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Manual 35116 505HT for Pelton Turbines
Woodward 27
Table 2-7. Communications (RS-232/RS-485) Specifications
Interface standard: RS-232C and RS-485
Isolation: 500 Vrms to EARTH and all other I/O
Baud Rates: 19.2K, 38.4K, 57.6K, and 115.2 K
Max Distance (RS-232): 15 m (50 feet) max
Max Distance (RS-485): 1220 m (4000 feet) max
A shielded cable is required when using this port.
RS-485 networks require termination at both ends with approx. 90–120
Ω impedance that matches the
characteristic impedance of the cable used.
Cable Note: Woodward cable 2008-1512 (3-wire) is a shielded, low capacitance 120 ohm cable that
is designed for communications. This cable is also used for CAN communications.
Table 2-8. COM1 Serial port (RS-232/485)
Board Connection
(8 pins)
Description
Pin 1 – RS232 Transmit
Pin 2 – RS-232 Receive
Pin 3 – Signam Common
Pin 4 – Shield (AC)
Pin 5 – RS-485 (+)
Pin 6 – Termination Resistor (+)
Pin 7 – Termination Resistor (-)
Pin 8 – RS-485 (-)
Plug Type: Side entry 3.5 mm, 8 A, pluggable with latching screw down
Max wire size: 1.3 mm² / 16 AWG for single wires, 0.5 mm² / 20 AWG for two wires
Figure 2-3. COM1 Example RS-485 wiring
Released