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Old 12-22-2002, 06:39 PM   #1
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MAX232 Interface Prob.
Just got through building the MAX232 ALDL Interface and hooked it up to laptop with Moates software and nothing. I am using the cig lighter adapter to bring in power and ground to interface. Do I still need to ground the A Pin on ALDL? ALso, do I need the resistor between A & B? Right now the only wire I have going to the ALDL is to Pin M. Also, Radio Shack was out of the 2N3904 so the pack I got says BC547. Would this cause a problem?
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Old 12-22-2002, 09:49 PM   #2
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Re: MAX232 Interface Prob.
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Originally posted by justme
Do I still need to ground the A Pin on ALDL?
Yes.
Quote:
Also, Radio Shack was out of the 2N3904 so the pack I got says BC547. Would this cause a problem?
Possibly, are the BC547's NPN?
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Old 12-22-2002, 11:19 PM   #3
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What is the purpose of grounding the A pin on the ALDL, isn't it a ground anyway? Also yes the package was Radio Shack Part# 276-1617 and it says NPN-Type Switching Transistors. It contained 15 different transistors with 3 or 4 of each number. 2N4401, PN4141, MPS6514, and BC547. I am going to try the other Shack tomorrow and see if they have the 2N3904's in stock.
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Old 12-23-2002, 12:17 AM   #4
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Yes, pn A is ground, but it is ECM ground, you need to make sure you are getting a good connection to the ECM ground.
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Old 12-23-2002, 01:39 PM   #5
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Got the 2N3904's from the Shack today and scrapped the MAX232 and built the two transistor interface. Works great!!
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Old 12-23-2002, 01:39 PM
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