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Part Number: SN65HVD1792
On a card I am working on there are two rs-232 to rs-485 circuits, one contains one ISL849IB and is connected to a max232. The second circuit again has a max232 but then has two ISL849IBs that share an RS-485 bus line. I have replaced all 3 ISL849IB chips with SN65HVD1792s. The first circuit works perfectly, the second circuit does not.
The first circuit takes rs-232 in, communicates via TTL through Schmitt triggers which then go to the ISL849IB which is then connected to a rs-485 bus line.
The second circuit has two incoming rs-232 signals that go to the max232. The max232 TTL (through Schmitt triggers) for each rs-232 bus each go to an ISL849IB. Both of these ISL849IBs share a single rs-485 bus however.
I would like to get in touch with an engineer from TI directly as I could share a capture of the relevant portions of the schematics. I cannot do so on a public forum though. I have a feeling someone with expertise on this subject could spot my problem in a matter of minutes.
I can help out. Do you mind if I send you an email directly using the address registered to your ti.com account? I think I will need to see a schematic snippet as you've mentioned, since I don't have a datasheet for the ISL849IB and I'm having trouble understanding all the connections you've described.
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In reply to Max Robertson:
That would be great.
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