Low voltage RS232/Serial switch

This schematic is useful when you have 2 devices that needs to be controlled by 1 MCU. As it's seen below, the MCU switches between the 2 serial devices. The MCU can only talk with 1 device at a time with both RX/TX channels.

SW1 can also be controlled by the MCU. U1 is 74HC04 or equivalent. U2 is SN74LVC125A or equivalent.

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Reference:
WizFi250 Datasheet v1.01
PDF manuals:
Texas Instruments SN74LVC125A, NXP 74HC04