is it possible to connect Datect 3530 m to a 16550A serial port via COM port
Are 16550A and RS-232 interface the same?
yes, you can connect a cash register to the Com port
here's what Wikipedia writes about this port
16550 UART (universal asynchronous receiver/transmitter) is an integrated circuit for organizing communication via a serial interface, developed by National Semiconductor. It is often used in IBM PC-compatible computers, where it is usually connected to an RS-232 interface.
The 16550 chip also contains a FIFO buffer for transmitted data, however this is not so critical: if this buffer is absent, data is not lost, but only a delay occurs in its transmission, i.e. the actual transmission speed decreases
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