However, if the faster (and bi-directional) 8192 baud ALDL data stream is to be read, then the complete circuit as shown here is required. " Note that Q1, D1 and R3 are not necessary if only 160 baud ALDL data is to be read. I just tried a simple read-only ALDL to RS232 circuit and same thing, not connecting. I could use a diagram for a known good circuit to convert the ALDL to RS232.Īpplication: 1992-93 truck 2.5 L4 TBI “A” 元8 So, now it seems the ALDL to RS232 circuit I made is not connecting the ECM to the Parallax converter. It passed the test so the Parallax converter is working, also tried it without the jumper wire between pins 2 and 3 and got a failed response from the cable test. Opened up TP and went into the plugin config and used the test cable option. I connected pins 2 and 3 together on the Parallax RS232 connector to create a loop back route.
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