Its been a while, but I think I was able to lift the receiver enable pin and tie it appropriately. Should only add the cost of one resistor and a bit more copper.Īs for considereing other options, I would love to, but I am dictated by my customer. Add or remove the solder jumper and the recieve enable would be enabled and the transmit enable would go back to the micro. By default it would connect the /RE and DE as right now. Not that Sparkfun reads these comments (its been two YEARS since I posted), but if they do, I would suggest the next revision of the board include a solder jumper to allow for a "receiver always on" mode.
Usb 485 converter Pc#
The USB-485 Converter provides easy connectivity between the PC and standard communication ports, not requiring any PC reconfiguration, assignment of IRQs, or jumper settings.
Usb 485 converter serial#
Otherwise I contend they have their heads in a dark place. USB to RS485 Converter is an intelligent module that connects to a PC USB port providing a high-speed asynchronous RS-485 serial port. If in the commercial world RS-485 is only used for single duplex single master to slave setups then their implementation is fine. If they are the same, great if not, you had a collision and must rebroadcast. When you transmit, you read back what you wrote. For this reason, the receiver is always left on. In such systems it is important/critical to know if you have had a bus collision. I suppose this is a matter of taste, but most systems that use RS-485 in the military world use it because it allows for a multidrop system with limited number of wires. Select Hardware Flow Control (RTS/CTS) in your favorite program or library and away you go! Cycle the USB device (unplug and re-plug).FT EEPROM -> Hardware Specific -> IO Controls -> C1 (select) TXLED#.FT EEPROM -> Hardware Specific -> IO Controls -> C0 (select) RXLED#.FT EEPROM -> Hardware Specific -> Invert RS232 Signals -> (check) Invert CTS#.Devices -> Scan and Parse (Ensure you have the correct device if you have a number connected.You could solder pin 11 to ground or better yet, I recommend users perform the following EEPROM change to the FT232RL using the FTDI FT_Prog utility (). The CTS line being high prevents the UART from sending data as the CTS line is the counterpart for RTS/CTS flow control. The CTS# line is unconnected and therefore internally pulled high. The SP3485 is a half-duplex transceiver, so it can only communicate one way at a time, but it can reach transmission speeds of up to 10Mbps. The TX and RX LEDs are reversed as I would expect to see TX LED pulse when sending data to the 485 bus. This is the newest revision of this board and this breakout board pairs an SP3485 RS-485 transceiver with an FT232RL USB UART IC to convert a USB stream to RS-485. This compact device quickly converts USB port connections to RS-422/485 so you can connect legacy serial devices to a newer PC or laptop. LEDs indicate transmitting and receiving of data. Serial terminal block can be removed for easy wiring. Read for quick and easy fixes! My adapter did not work correctly out of the box. USB 1.0, USB 1.1, and USB 2.0 compatible (12 Mbps).
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