1101/1201 Technical Manual
07/19/02 Page 10 1201 - JULY 19 '02
3.3.4 Signals to and from the Control Head
OFF/on When the STANDBY switch in the Control Head is pressed, it drives the OFF/ON
line low, causing the Power circuitry in the SPU to turn the 5 volts line on, turning
the Autopilot on.
SD IN All communications to the autopilot are made through the SPI data line. This
data line sends all relevant data from the Head to the SPU.
DISP CLK Clock for SPI data entering the head. This is an SPI clock and should be running
around 1/32 * E-CLK (62.5 KHz)
KEY Clock Clock for SPI data leaving the head. This is an SPI clock and should be running
at around 1/32 * E-CLK (62.5 KHz)
DISP Data SPI Serial Data into the Head from the SPU.
RKEY Data Transfers SPI Serial Data from the Remotes to the Head.
PORT Output to tell the head when the rudder is moving Port.
STBD Output to tell the head when the rudder is moving STBD.
ALARM When the buzzer is to sound, the alarm line goes low.
HEAD MODE Line to tell the Interface if it is a Head or a Remote. +5 volts indicates a head,
and 1m ohm resistor to ground indicates a remote.
PWR + 5 Volts.
GND Common.
3.3.5 Signals to and from the Compass
136 KHz P1 Phase 1 Excitation signal to the Compass
13.6 KHz P2 Phase 2 Excitation signal to the Compass.
REFERENCE 2.5 volt reference signal to the Compass.
SINE Sine signal from the Compass.
COSINE Cosine signal from the Compass.
+12 VOLTS Power to the Compass unit.
GND Common ground.
3.3.6 Signals to and from the Remotes
CMD/CTRL Signal used to tell the Remote unit whether it is in control of the system or not.
+5 V + 5 volt power to the Remotes.
DISPLAY CLOCK
ANALOG INPUT
ROTARY SWITCH 0 Signals to tell the SPU which position the Remote rotary switch is in.
ROTARY SWITCH 1 Signals to tell the SPU which position the Remote rotary switch is in.
TURN Signal from the Remote that a Special turn is being initiated.
DODGE Signal from the Remote that a Dodge is being initiated.
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