![]() ![]() This is referred to as 232 TTL.ĭiagnostic tools for Honda (motorcycles and marine engines), Kawasaki (motorcycles, ATVs and Jet-Skis) and Suzuki (motorcycles and ATVs) are offered by some Chinese companies too. For that reason many Micro Controller Units (MCU) that include built in serial communications hardware provides the logical part but outputs the signals at TTL levels and requires you to provide the physical interface circuits. The logical RS232 is very popular but the fact it requires a dual voltage power supply makes the interface circuit complicated. TTL is a physical standard that operates at 0-5V. The logical part describes how the data is formatted and transmitted and has to do with baud rates, stop, start, and parity bits The physical part describes the electronic hardware requirements. ![]() The problem is that Registered Standard 232 (RS232) is both a Logical standard and a Physical standard. ![]()
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