Serial (UART) communication requires both ends to agree on the same baud rate to correctly sample and decode bits. SysA transmits at 115200 bps while SysB is configured to receive at only 2400 bps — a roughly 48x mismatch. Because SysB samples the incoming signal at its own (much slower) clock rate, it misinterprets the bit timing entirely, so instead of correctly reconstructing "SendMeData," it receives garbled/junk data (misaligned bits, framing errors). It won't halt or necessarily throw a clean 'communication error' at the application layer — mismatched UART baud rates typically manifest as corrupted/garbage characters rather than a clean failure signal.