600-00174-001
Rev. 03, 13 May 2008
41
WSI AV-300/350 Installation Manual
Note 1.
Standby – Optional, switch to Ground places unit into standby mode.
NOTE: This input shuts down the receiver’s power (including weather data reception).
Returning to the operational state is equivalent to a power-on condition. Some data
products are transmitted at very long intervals and may not be available for viewing for
many minutes following a return to the operational state.
Note 2.
RS-232 Ports – A twisted shielded triplet can be used, or use two twisted shielded pairs
so that each signal is twisted with a signal ground wire. Ground any unused RS-232
receive (RX) inputs.
Note 3.
RS-422 Port – The COM1 RS-232 and COM1 RS-422 ports use the same
communications hardware and are not independent. Receive connections are not used
for the RS-422 interface – it is an output-only port.
The COM1 RS-422 transmit port will transmit the same data that is transmitted on the
COM1 RS-232 transmit port. It is okay to use both the RS-232 transmit port and the
RS-422 transmit port of COM1 so that an additional display may be driven.
Note 4.
RTS and CTS – These are optional synchronous communications signals that can be
used in conjunction with the COM1 RS-232 port. Connect COM1 RTS (pin 4) to
COM1 CTS (pin 45) for asynchronous operation with the COM1 RS-232 port or for
operation with the COM1 RS-422 port. Note that most displays do not require the use
of the RTS and CTS signals. If RTS and CTS connections are required for a display, a
receiver configuration chance must be made to enable the use of these pins for COM1.
Contact WSI Customer Support for information on how to do this.
Note 5.
Audio Signals – A twisted shielded triplet can be used, or use two twisted shielded
pairs so that both left and right channels are twisted with the associated audio ground
wire. Connect the audio ground to the audio panel and the AV-300/350 receiver to
eliminate common mode noise.
Note 6.
Reserved for future use, do not connect.
Note 7.
Chassis Ground – The chassis ground input pin must be connected to the airframe
ground if the case is not electrically connected to the airframe ground. If the case is
electrically connected to the airframe ground, then this pin may be left unconnected.
Note 8.
These pins are reserved for future use and should not be connected.
Note 9.
Power – A trip-free re-settable circuit breaker must be installed between the aircraft
electrical bus and the AV-300/350 receiver. Aircraft battery and its return should be
twisted pair. Shielding is optional. Do not connect this device to the essential
electrical bus.
