![]() for enhanced capabilities, and their firmware was upgraded too. Later ECUs added internal receive circuitry (the SXR Delco/Delphi transceiver chip). As well, get the 78L05 data sheet from Natsemi, and the IN914A data sheet from Fairchild.Įarly ECUs produced a fixed 8192 ALDL data stream when the user placed a 10k ohm resistor between ALDL connector pins A and B. More information is available from Maxim, or you can download the data sheets for their 5 Volt Interface Products. If you use a MAX233, which has a different pinout to the MAX232, you don't need to use any of the capacitors C1-C4, but the regulator still requires C5 and C6. Note that the 3.3 uF capacitors (C1-C4) may be reduced to 1 uF if these are readily at hand, or to 0.1 uF if you use the MAX232A.
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