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Henceforth, we shall consider Slave devices to be measuring instruments with serial communication, even if the cabling is similar for all Modbus devices. RS485 is the preferred serial communications standard for long distance industrial communications. Jumpers allow the RS485 termination and bias resistors, and the RS232 DTE/DCE mode to be user configured. If multiple analog input meters or transmitters are digitally addressed in command mode on an RS485 line using the Modbus RTU protocol or the Custom ASCII protocol, the rate becomes about 2 readings per second. Jumper J10 will place the unit in Loop-back mode for self test. In all other cases, half duplex and full duplex will work equally well. Then use front panel programming to set the baud rate, protocol, digital address, half or full duplex, and other available parameters. Setup is the same when multiple meters are interconnected via cables CBL03, except that all meters now need to be set to a different digital address via their front panel. The board with dual RJ11 jacks is the more popular since is can use commercial straight-through, non-reversing, 6-wire data cables with RJ11 connectors. Can I add an RS485 board to a meter later?

Laureate RS485 boards are available in versions with dual RJ11 jacks (ordering option 2, board P/N L485) and with dual RJ485 jacks (ordering option 4, board P/N LMOD). The presence of a new board and the type of board are automatically sensed by the meter’s firmware or by Instrument Setup (IS) software. The host software should attempt to connect to the device's IP and port to verify normal connectivity. I tried connecting it directly to the computer either with a normal network cable or with a crossover cable but the web page doesn't open. Laureate meters are modular with a middle slot reserved for a communication board, as illustrated in our Laureates Overview web page. See page 7 of the Laurel digital panel meter manual, page 7 of the Laurel counter manual, page 8 of the Laurel scale meter manual, or page 8 of the Custom ASCII protocol manual. 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. Both boards support the Modbus protocol and Laurel’s Custom ASCII protocol, as well as half-duplex or full-duplex RS485 communications.

Laureate meter and LT series transmitters support the Modbus RTU protocol and Laurel’s simpler ASCII character based Custom ASCII protocol. A challenge is that Laureate meters use RJ11 jacks, while Laureate LT series transmitters use screw-clamp connectors for three discrete wires. The solution is provided by the Laureate DIN rail mounted breakout board, which provides two RJ11 jacks with six screw clamp terminals all wired in parallel. All the ‘A’ terminals must be connected together and all the ‘B’ terminals must be connected together respectively. Each device has a communication port with two terminals, which are indicated for the sake of convenience as A and B. In these two terminals the communication cable is connected so that all the devices that take part in the communication are connected in parallel. RS-485 does not define a communication protocol; merely an electrical interface. RS-422 and RS-485 Standards Overview and System Configurations, what is rs485 cable Application Report (pdf). We provide free technical support, no-argument warranty repairs, and recommendations for your application. TSB-89A, Application Guidelines for TIA/EIA-485-A does not recommend using star topology. 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.

By using two jacks, up to 31 L485 boards can be connected in parallel for daisy chaining using readily available CBL03 data cables with no need for a hub. In some countries, inserting two cables into the same screw terminal is permitted. So you'll need to really have a high-end PC at each terminal to actually store prices. For an off, mark or logic 1 state, the driver's A terminal is negative relative to the B terminal. These are used in programmable logic controllers and on factory floors. The issue also exists in programmable logic controller applications. Please be patient as we make every effort to help you to resolve the issue. Contact us for options help. Conformal Coating, cable, and connectors, are factory options. What communication protocols are supported by RS485? The maximum number of repeaters that should be serially connected is 3. A higher number introduces excessive delays in the communication system.