3.2.1 Host PC with On-Board MCP2200 USB-to-UART Converter
The simplest method to use the RNWF11 UART to Cloud Add On Board is to connect it to a PC host that supports USB CDC virtual COM (serial) ports using the on-board MCP2200 USB-to-UART Converter. The user can send simple ASCII commands to the RNWF11PC Module by using a terminal emulator application. In this situation, the PC acts as the host device. In addition to UART, status and other control GPIOs from the RNWF11PC Module are also connected to MCP2200 GPIO pins.
Note: The MCP2200 is configured in Reset condition until the USB supply is plugged in.
Pin on MCP2200 | Pin on RNWF11PC Module | Description |
|---|---|---|
| TX | UART1 RXD | RNWF11PC Module UART RXD |
| RX | UART1 TXD | RNWF11PC Module UART TXD |
| RTS | PA11, UART1 CTS | RNWF11PC Module UART CTS |
| CTS | PA13, UART1 RTS | RNWF11PC Module UART RTS |
| GP0 | — | — |
| GP1 | — | — |
| GP2 | NMCLR | RNWF11PC Module Reset pin |
| GP3 | PA10, WAKE_INPUT/INT0 | Wake input |
| GP4 | PB12, IRQ | Interrupt |
| GP5 | — | — |
| GP6 | — | — |
| GP7 | — | — |
Note:
The MCP2200 automatically enters a Reset state when the USB cable is not connected. If using the mikroBUS, there is no need to manually disable the MCP2200. The users can easily switch the power selection header (J5) based on whether the board is used in a standalone scenario or as a mikroBUS host.
The power selection header (J5) provides a solution for exceptional cases where the USB cable needs to be plugged in for power when using mikroBUS, a scenario not typical for the board’s default design. When utilizing the mikroBUS connector, the power is intended to be supplied from the mikroBUS 3V3.