Northern Airborne Technology 250 - Manual (Page 11)

EQUIPMENT MANUAL 250-16-1
250/250-16-1 Page 2
The operating modes of the Model 250 are established when either a ground (low) signal or a 12
to 32 VDC (high) signals applied as listed below to the connector pin listed:
Pin No. Control
Identification Function
Signal
P50-16
Low ADF 1 Switch Connects ADF 1 input
audio to Left and Right
Speaker outputs.
P50-15 Low ADF 2 Switch Connects ADF 2 input
audio to Left and Right
Speaker outputs.
P50-14 Low PSC Switch Connects Pilot Select
COMM input audio to Left
and Right Speaker
outputs.
P50-13 Low TV Swith Connects TV input audio
to Left and Right
Speaker outputs.
P50-5 Low Stereo Switch Connects Stereo Left and
Stereo Right input audio
to Left and Right
Speaker outputs, respectively.
P50-24 Low PA Key Connects PA MIC input
audio to PA Sidetone and
Left and Right Speaker
outputs. Opens ADF,
PSC, TV, and Stereo input
audio circuits.
P50-25 Low Briefer Switch Connects Briefer input
audio to PA Sidetone and
Right Speaker outputs.
Opens ADF, PSC, TV and
Stereo input audio circuits.
P50-31 High No Smoking Chime tone to Left and
Right stereo outputs.
P50-32 High Seat Belt Chime tone to Left and
Right stereo outputs.
P50-33 Low Cabin Call Ringer tone to Left and
Right stereo outputs.
P50-34 Low Hook Switch Disables ringer tone.
*An application or removal of a high signal at pins P50-31 and P50-32 will provide a chime tone at
Left and Right Speaker outputs.
NOTE: P50-XX is a pin on the 37 pin connector, P50-1.
P40-XX is a pin on the 25 pin connector, P40-1.