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Technical Support On-Line Manuals MCB1000 User's Guide | Serial PortThe MCB1000 board connects the on-chip serial UART to the ST3232 (IC6) which converts the logic signals to RS-232 voltage levels.
In addition to the standard 3-wire interface, the COM DB9 connector is wired to allow a board RESET via the DTR pin, and to enable In-System Programming (ISP) via the RTS pin as shown in the figure below.
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