To set up communications for your meter or counter, see the Serial Communications section of its user manual. Finally check the documentation on your RS485 device to see how to set it up, and if can be disabled by default. The two jacks are for RS485 cable in and RS485 cable out. With this boards, a CBL03 lines with RJ11 connectors can branch out to support an RS485 line consisting of three discrete wires. Where can I find RS485 pinouts? If the total length of the main cable is less than 50 m termination resistances can be avoided at the ends of the main cable. In order to avoid signal reflections, a 120 Ohm termination resistance must be fitted on each end of the main cable. The branches must be no longer than 1200 m! This provides high noise immunity and allows distances up to 4,000 ft (1200 meters). A challenge is that Laureate meters use RJ11 jacks, while Laureate LT series transmitters use screw-clamp connectors for three discrete wires. So make sure that your screen doesn't go to sleep while you're upgrading and that every single module has been upgraded as well. Select the firmware for the appropriate module -- Wherever you have downloaded it to.

If your system keeps failing, or is unreliable, we have isolated, doubly isolated, noise resistant, cost effective, and proven solutions for difficult environments. WARNING: Do NOT connect this device to a telephone system under any circumstances. In fact, there is no such thing as an RS485 cable since RS485 is a protocol for serial communication (like between inverter and Zero export device) and Ethernet is a protocol for carrying internet data (between router and inverter) whereas CAT6 is a cable standard. Confirm serial port parameters such as baud rate, data bits, and stop bits: Baud rate should be configured according to the connected RS485 device, commonly used rates are 9600 and 115200; Refer to the device manual or contact RS485 device technical support for configuration, especially if set to Modbus mode, confirm if the function code matches. The RS485 driver, with 22 Ohm isolation resistors and built in electro-static protection, allows 32 standard loads at 4000 ft. The older RS232 standard uses single-ended signals, is more sensitive to noise, and is only rated for distances up to 50 ft (15 meters).

RS485 is the preferred serial communications standard for long distance industrial communications. These cables allow the dual RJ11 jacks of the RS485 option board of Laureate meters (digital interface ordering option 2) to be daisy chained and to be addressed digitally with no need for a hub. Specify type of power connector when ordering. 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). Can I add an RS485 board to a meter later? You can do different combinations, for example if you have different Gen modules on your stack. In practice, Cat 5 cables have been used successfully in many installations, but there are some concerns. The capacitance is close to 12.5 pF/foot but there is a small impedance mismatch (100 ohms for Cat 5, 120 ohms for RS-485). 100 ohms, Cat 5 cables almost meets the electrical requirements for RS-485 cables. In some countries, inserting two cables into the same screw terminal is permitted.

Can I mix Laureate LT transmitters and meters on the same RS485 line? 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. A meter will a thermocouple input and set for Modbus RTU needs to set to full duplex even if the wiring and the receiving unit are for half duplex. Use a 485 to USB serial cable, connect it to the interface of the 485 device and the computer's USB port, assign a COM port on the computer, open serial debugging assistant software, set the serial port parameters consistently, input the corresponding COM port, and monitor the data from the 485 device. In the case where a TCP connection is established but no data is received, following the assessment in 1), if the TCP channel is established but no data is received, further investigation is necessary. Be sure to use a wire pair such as the blue and blue/white pair for the data lines and a third wire or pair twisted together for the common connection. Normally, this connection is made at one end of the main cable.

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