ComNav Commander P2 - Figure 5 - the Commander P2 SPU (with Wiring Cover Removed); Signal Processor Unit

ComNav Commander P2 & P2VS Installation & Operation System Overview
Document PN 29010074 V4.1 - 28 -
Signal Processor Unit
PN 20110006 (P2)
PN 20110009 (P2VS)
The Signal Processor Unit (SPU), as its name suggests, accepts a number of signals from
the other components of the autopilot system, and processes them as necessary to control
the movement of the boat’s rudder so as to maintain a given Heading. As well as steering
the boat, the sophisticated software within the SPU continually checks all aspects of the
autopilot’s performance, and will advise the user via the Control Head if any problems are
encountered.
The SPU is the central hub for all wiring in the system, with 13 connectors for all power and
input/output signals. A Wiring Cover protects the connectors when the system is in use – but
is easily removable for installing cables & wiring.
It also contains a diagnostic section, containing several status & activity LEDs, some
testpoints for service use, some adjustment controls and the system’s two fuses. The
diagnostic section has a clear cover, which allows easy viewing of the LEDs, and inspection
of the status of the fuses.
The P2 & P2VS SPUs are identical, except for firmware (they can only be distinguished by
the part number on the serial number label – and in operation).
Figure 5 – The Commander P2 SPU (with Wiring Cover Removed)