After several frustrating days of trying different combinations of RS485 hats, different wiring connections, with and without termination resistors and ordering a USB RS485 adapter which would also fail to connect, we tried to install the Data logging WiFi adapter. Removing the WiFi adapter and connecting directly to the inverter's COM port resulted in no data again so we knew that there was something on the WiFi adapter enabling the data from the inverter. If your PC or controller only has RS232 port then you need an RS232 to RS485 converter or adapter for your PC or controller. What RJ11 cables should I use with RS485? This cable provides a USB type A connector for the PC end and an RJ11 connector for the meter end. Once the program got uploaded, Connect the BOOT SEL pin in ARIES board using a shorting jumper / Female-Female connector (NOTE: Shorting jumper is always preferred. RS485 uses two wires and sometimes a ground connection, so we used a twin-screen cable to go between the inverter to the EM112 Series Energy Meter and then onto the Raspberry Pi with a DB9 connector connected to the RS485 Pi board. When a single RS485 meter or counter is connected to a PC via a cable CBL06, set the PC to 9600 baud.

First set jumpers for your type of communications. Let’s power up the ARIES v2 board via the USB port of a Laptop/Desktop/PC and burning the code into the ARIES v2 board, we have to use a micro-USB type B to USB type A cable. Use Laurel’s 6-wire data cables CBL03-1 (1 ft) and CBL03-7 (7 ft) to interconnect meters if these lengths fit your application. If the PC is connected to the multiple Laureate instruments on an RS485 bus via an Ethernet-to-RS-485 gateway board or a USB-to-RS485 gateway board, use Laurel’s free XLOG2 datalogging software. Both boards support the Modbus protocol and Laurel’s Custom ASCII protocol, as well as half-duplex or full-duplex RS485 communications. RS485 cable length can be as long as 1.2 km, while RS232 only about 25 meters. A single analog input meter or transmitter can stream readings to a PC at up to 60 readings per second and the Custom ASCII protocol set to continuous (or streaming) model.

Set the PC to N81 for the Custom ASCII protocol, or to N82 or E81 for the Modbus RTU protocol. DH 485 is a proprietary communications protocol used by Allen-Bradley in their line of industrial control units. In theatre and performance venues, RS-485 networks are used to control lighting and other systems using the DMX512 protocol. These characteristics make RS-485 useful in industrial control systems and similar applications. The EIA has officially disbanded and the standard is now maintained by the TIA as TIA-485, but engineers and applications guides continue to use the RS-485 designation. Then use front panel programming to set the baud rate, protocol, digital address, half or full duplex, and other available parameters. Upload the code in ARIES v3 board which is set as Master in this example. The cable should be connected to UART-0 port of the ARIES v2 board, and the Laptop/Desktop/PC should be preinstalled with Arduino IDE and VEGA ARIES boards of latest version. 5. Select the virtual serial port for the board. We installed a new Micro SD card with the latest Raspberry Pi OS, and after updating the software, the serial port and i2c bus were enabled. Being full-duplex, the communication link can be treated like a standard serial port as it does not require to check for collisions.

If the slave (ARIES v2) receives command "1" then LED will Turn OFF and print "1" to the Arduino IDE serial monitor or, if slave receives command "0" then LED will turn ON and print "0" to the serial monitor. Above mentioned steps are needed to flash the program to ARIES board permanently. What are setup steps for RS485? Where can I find RS485 pinouts? Digital communications networks implementing the standard can be used effectively over long distances and in electrically noisy environments. Can be used over long distances in electrically noisy environments. We can also use this to upload to our long-term storage data logger online. What cable should I use to connect meters with an RS485 port to the USB port of a PC? We tried several RS485 Pi hats, but all had the same issue. RS485 is specified for multi-point communicates where multiples devices have their own address on the same communication line, while RS232 is only specified for point-to-point communications. In order to exchange information on the RS485-bus the same timing and encoding is used as on a normal serial interface (RS232).