General comms channel

Description of General Comms Channel (channel 102):

Channel Number	102
Total Length	Variable length message

CHANNEL

MESSAGE LENGTH

MESSAGE TYPE

DATA0

DATA1..............DATAn

CHECKSUM

MESSAGE TYPE description

Triggered test flags:

Bit 0:	Enable analog output
Bit 1:	Enable pulse output
Bit 2:	Enable distance output (no longer used, but retained in case required again)
Bit 3:	Subsequent start triggers reset test (no longer used)
Bits 4->7	Currently unused

Units to display results:

Bits 0-3	Speed units:

		0 = m/s
		1 = kph
		2 = mph
		3 = knots
		4->7 currently unused
Bits 4->5	Distance units:

		0 = m
		1 = ft
		2->3 currently unused
Bits 6->7	Accel units:

		0 = g
		1 = m/s/s
		2->3 currently unused

Interval flags

No bits set:	No interval output
Bit 0 set:	Output at speed intervals
Bit 1 set:	Output at distance intervals
Bit 2:	Currently unused
Bit 3:	0 => MFDD thresholds are % of start speed 1 => MFDD thresholds are speed in currently selected speed units
Bits 4-7:	Currently unused

Info at interval flags

Bit 0:	Time into test
Bit 1:	Deviation distance
Bit 2:	Acceleration
Bits 3-7:	Reserved for when a customer inevitably wants something else output!

Note: Path dist is always output for speed intervals, and speed is always output for dist intervals, hence we don't include them here.

Trigger rule parameters

Byte 0:	Bits 0->1:	Hardware index (trigger number or ADC number, 0->3)

	Bits 2->6:	Reserved in case we require larger hardware indexes in future
	Bit 7:	Polarity, 0 => falling, 1 => rising


Byte 1:	Condition	0 => NULL (not configured) 1 => SPEED, units of m/s 2 => TO A HALT (end condition) or PULL AWAY (inertial based) (start condition) 3 => ACCEL_LONG , units of g 4 => ACCEL_LAT, units of g 5 => ANALOG, units of volts 6 => HARDWARE TRIGGER, no units 7 => COMMAND MSG, no units 8 => DISTANCE, units of meters 9 => PULL AWAY (speed based) 10 => MARKER TRIGGERED (unit of distance in meters)

Marker triggered:

Start/End marker (longitude, latitude, heading) [index 54 to 65] contains values of start marker if �Marker triggered� is selected for one of the conditions of �Start condition�. If �Marker triggered� isn�t selected for �Start condition�, and is selected for one of the conditions of �End condition�, these fields contain values of end marker.

End marker (longitude, latitude, heading) [index 66 to 77] contains values of end marker if �marker triggered� is selected for one of the conditions of �End condition� while �marker triggered� is selected for one of the conditions of �Start condition�.

If �Marker triggered� isn�t selected for any condition, these fields are not present in the message.

All marker values are big endian, 2's complement signed 32-bit integers.

DataAndConfigurationMessages / 102GeneralCommsChannel