must be asserted true to enable the RS-485 driver. When RTS is deasserted it disables the transmit driver and enables the RS-485 receiver. The RTS signal has no effect on the RS-422 receiver. The RS-422 receiver is always functional. But RTS must be asserted to enable the RS-422 ...
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suspended mode 4 USB_LED USB activity LED connection 5 VBUS_DETECT USB Voltage Bus detection 6 NC No connect 7 UART_LED UART Activity LED connection 8 RS485_TXEN Transmitter control pin for RS485 transceiver 9 RTS UART request to send connect to CTS when hardware flow control is no being...
Device block diagram USBDP USBDN TXD RXD RTS CTS RS485 CTL Figure 2. USB2SER — 24-QFN Package USB2SERA10 Data Sheet, Rev. 2 4 Freescale Semiconductor 1.3 Recommended system connections Pins and Connections Figure 3. System connections working at 5 V Figure 4. System connections working ...