Three on-board LED indicators for convenient monitoring of power and signal transmission/reception status. On-board TTL serial port with 3.3V and 5V level conversion circuitry, enabling switchable TTL communication levels. On-board self-resetting fuse and transient suppression diode provide protection against overcurrent, overvoltage, reverse current, and electrostatic discharge, enhancing surge immunity for stable and secure communication. On-board I0 protection safeguards computers against surges. DC power jack with smooth insertion/removal, robust reliability, and reverse polarity protection.
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