The basic function of 89C2051 here is to detect the alarm level signals of the external multi-channel wired alarm sensors, and convert them into one-to-one corresponding \"COMSMSXX\" instructions, and finally send them to JB35/JB35G from the serial port in the format of 9600BIT/S, 8, N, 1, triggering the alarm SMS in \"Alarm Settings (2)\" of JB35/JB35G. Due to the limitation of 89C2051 port lines, we only expanded 12 channels of external sensor parallel input ports. If the user needs to convert all 20 channels into parallel input ports, it is necessary to use a single-chip microcomputer with more ports, such as 89C51.
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