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Decoding RS-232, RS-485, & RS-422 using Saleae Logic


The new Saleae Logic products (Logic 4, Logic 8, Logic Pro 8, & Logic Pro 16) can be used to read and decode RS-232, RS-485, and RS-422 data up to +/- 25V.

Our older Logic products (Original Logic & Logic16) have a 0V to 5V absolute maximum range. Therefore, neither product can be used to measure signals outside of this range. This limits its usage for directly recording RS-232, RS-485, and RS-422, which exceed this range in many cases.

Precautions to Avoid Damage to the Saleae Logic These protocols typically operate at higher voltages, sometimes up to +/- 25V. For this reason, there are several precautions and set up requirements to consider beforehand, which you can read more about below: How to safely record RS-232, RS-485, CAN, Ethernet, 12V or 24v TTL, or other non-CMOS signals

Use the Async Serial Analyzer RS-232, RS-485, and RS-422 transmit data via asynchronous serial communication. For this reason, you can use our Async Serial Analyzer to decode the data. You can view our setup guide below: Using the Async Serial Analyzer

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