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All serial output formats use the same output packet.
Serial Specifications
| • | 115,200 bps (software selectable), 8 data, 1 stop, no parity |
| • | Packets are sent at 10Hz |
Packet Description
| • | Words are send with most significant byte first. |
| • | The checksum is calculated as the byte sum of the packet subtracted from 0xFF. The byte sum of the packet, including the checksum, should be 0xFF. |
Byte
|
Contents
|
0
|
Identification byte (0x69)
|
1
|
Speed (kph, LSB = 1 kph)
|
2-3
|
Rpm (LSB = 0.25 rpm)
|
4
|
Gear (0 - 6)
|
5
|
ECT (degrees Celsius + 40, LSB 1 deg)
|
6
|
IAT (degrees Celsius + 40, LSB 1 deg)
|
7
|
Battery voltage (volts, LSB = 0.1V)
|
8
|
TPS (0% = 0x15, 100% = 0xE5)
|
9-10
|
MAP (mbar, LSB = 1 mbar)
|
11-12
|
Injector duration
|
13
|
Ignition timing (degs + 0x80, LSB = 0.5 deg)
|
14
|
Output bit field
|
15
|
Input bit field
|
16
|
Unused
|
17-18
|
Lambda (0x8000 = 1.00, LSB = 1/0x8000 lambda)
|
19-20
|
Knock count (knocks since power on, LSB = 1 knock)
|
21
|
Checksum
|
Output bitfield
Bit
|
Meaning
|
0
|
Unused
|
1
|
Brake switch
|
2
|
AC switch
|
3
|
AC clutch
|
4
|
Unused
|
5
|
EPS/PSP
|
6
|
Fuel pump
|
7
|
Radiator fan
|
Input bitfield
Bit
|
Meaning
|
0
|
VTEC oil pressure
|
1
|
VTEC solenoid #1
|
2
|
VTEC solenoid #2
|
3
|
MIL
|
4
|
Nitrous 1 arm
|
5
|
Nitrous 2 arm
|
6
|
Nitrous 1 active
|
7
|
Nitrous 2 active
|
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