Serial Communication With Labview Tutorial Loops

This allows the data to flow from the transmit to the receive pins Since the communication is differential for RS-422 and RS-485, the TXD connects to the RXD and the TXD- connects to the RXD- pins. https://linantacom.therestaurant.jp/posts/16505118

Pins 7 and 8 are used for RTS/CTS hardware flow control where pins 4 and 6 are used for DTR/DSR hardware flow control.. For RS-422/485, you will need to connect pins 2 to 3 and 6 to 7 Both of these connections are required for RTS/CTS hardware flow control since RS-422/485 have differential connections.. For RS-232, the CTS and RTS pins must be connected along with the DTR and DSR pins.. To perform a loopback test for RS-232, the TXD pin must be connected to the RXD pin.. Note that not all serial devices, especially those with many connections on one card, allow hardware flow control on every serial output of the device. HERE

Figure 1: Pinout diagram for DE-9 Connector To perform a loopback test with no hardware flow control, you will need to connect pins 2 and 3 for RS-232 and pins 4 to 8 and 5 to 9 for RS-422/485.. These connections can be seen in red below (figure 2 for RS-232 and figure 3 for RS-422/485). 3

For RS-422 and RS-485, CTS should be connected to RTS and CTS- should be connected to RTS. 73563d744f HERE

Loopback tests can be used for RS-232, RS-422, and RS-485 serial communication For more information on RS-232, RS-422, and RS-485 see the. Click