Innovate-motorsports OT-2 SDK Manual do Utilizador descarregar pdf (Página 14)

The last piece of information that we generally care about is the packet type (remember,

we have two):

Word

Bit

D/S

This is all handled by bit 12. A 1 indicates that it is a DATA packet, a 0 indicates that it is

a RESPONSE packet.

This leaves three other bits:

Word

Bit

D/S

Of these, only bit 14 might be of interest. It indicates that someone in the chain is

recording. This is how our gauges know when to blink the ‘recording’ light. Bits 10 and

11 should be ignored.

Now that we can sync to the stream and grab packets, let’s look at what is inside them.

Data Packets

In discussing the basic MTS scheme, we referred a lot to ‘devices’, but when analyzing a

data packet, it is much easier to think in terms of what we commonly refer to as

‘channels’. A channel would be a single sensor reading.

Devices can add more than one channel to the data packet (though the firmware in many

of the devices, and our LogWorks software assumes that the total count of channels in the

packet will not exceed 32). But, while an LC-1 adds 1 channel, an LMA-3 adds 5, an OT-

1b/2 adds from 1-16, and an LM-2 can add up to a whopping 23, the channels added will

always be one of three types:

• An Aux Channel

• A ‘new’ lambda/AFR channel

• An ‘old’ (LM-1) lambda/AFR channel

Aux Channels

An Aux Channel is the simplest, as we can see from the Serial 2 Specification:

Word

Bit

D12

D11

D10

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 75 76

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Innovate-motorsports OT-2 SDK Manual do Utilizador Página 14