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On-Line Manuals MCBSTR9 User's Guide | Serial PortsThe MCBSTR9 board connects the two on-chip serial UARTs to the ST3232 (IC7), which converts the logic signals to RS-232 voltage levels.
The serial ports (COM1 and COM2) are configured as a standard 3-wire interface. The DB9 connector is wired to loop the PC's handshaking signals back to the PC. Refer to the figure below for details.
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