51 MCU target board over a serial port to the serial port selection switches. COMX down mouth (then under surveillance equipment) for the 16-way RS232, uplink port (Hospitality Management PC) as a way RS232 or 1 10BASE-T. COMX to support four cascade. A51 source package as the standard code, can be used directly KEIL compiler generates Shaoxie documentation, the goal of chip design applications at89s52.

COMX_INT.A51
COMX_SUB.A51
COMX.A51
COMX_DFN.A51

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