Woodward Vertex-Pro, Installation/Hardware Manual

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Manual 26489V1 Vertex-Pro Motor-Driven Compressor Control
Woodward 25
5.1.6—RTN Ports
Two Real Time Network ports (RJ45) are available to provide communications
between the main chassis CPU's and any Remote RTN modules located in an
expansion chassis. The GAP software application defines the expansion racks,
their I/O modules, and the use of these RTN ports (GAP block is RTN).
This option is not used by the Vertex-Pro.
5.1.7—RS-232/422/485 Serial Port
An isolated, configurable RS-232 / 422 / 485 serial port is located on the front of
the CPU module and is configured by the GAP software application. The baud
rate is selectable from 300 baud to 57.6 Kbaud. Shielded cable is required when
connecting to the CPU module’s serial port. Using shielded cable will help ensure
the robustness of the serial communications.
Pin 1 – RS-422 Transmit (+)
Pin 2 – RS-232 Receive
Pin 3 – RS-232 Transmit
Pin 4 – RS-422 Transmit (-)
Pin 5 – Signal Ground
Pin 6 – Termination Resistor (+)
Pin 7 – RS-485/422 Receive (+)
Pin 8 – RS-485/422 Receive (-)
Pin 9 – Termination Resistor (-)
Figure 5-3—CPU Communications Port (DB9F)
Installation
Termination
For RS-422, termination should be located at the receiver when one or more
transmitters are connected to a single receiver. When a single transmitter is
connected to one or more receivers, termination should be at the receiver
farthest from the transmitter. Figure 5-4 is an example.
Figure 5-4—RS-422 Terminator Locations