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These ports use an RJ11 socket as physical connector. In order to increase the extent of the Modbus network, repeaters can be used; and signal amplifying and regenerating devices provided with two communication ports that transfer to each what they receive from the other. 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. Then use front panel programming to set the baud rate, protocol, digital address, half or full duplex, and other available parameters. The WattNode® BACnet and Modbus® meters communicate using RS-485 (TIA/EIA-485-A) half-duplex, differential signaling at 9600, 19200, 38400, and 76,800 baud. A kpr rs-485 to usb cable is a specific type of converter that facilitates the conversion between the industrial communication protocol and the universal serial bus. RS-422 and RS-485 Standards Overview and System Configurations, Application Report (pdf). 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. 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. Is there an easy way to log data to a PC from multiple instruments on an RS485 bus? All about RS485 - How RS485 Works and How to Implement RS485 into Industrial Control Systems? The normal way to implement this is with a two wire system with differential signal levels. The RS485 chip converts CMOS level transmit (Tx) and receive (Rx) lines to differential RS485 voltages than can be sent over long distances. The USB-RS485-WE-1800-BT from FTDI is an USB to UART cable with RS485 level UART signals. Support the conversion of USB to RS422/RS485 interface.

This cable provides a USB type A connector for the PC end and an RJ11 connector for the meter end. The RJ11 socket in the Unitronics PLCs provides six signal pins. The symmetrical pin layout of the RJ11 sockets on the Unitronics PLCs allows an easy way of interconnecting the PLCs with both RS232 and RS485 communications. This provides high noise immunity and allows distances up to 4,000 ft (1200 meters). 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. The two jacks are wired in parallel by circuit traces on the circuit board. When in full RS232 mode, the six available pins are assigned to the most used RS232 signals. These pins are normally used for the DTR, data terminal ready and DSR, data set ready signals. A symmetrical pin-layout allows two DTEs, data terminal equipment, to be connected directly without use of a modem or other DCE, data communication equipment.

In some applications, terminal strips were used in place of a connector. The RJ11 connector can be used for both RS232 and RS485. The RJ11 socket is interesting, because the manufacturer choose to have a symmetrical pin-layout, just as with the MMJ connector on DECconnect systems and the RJ45 jack in the Yost standard. Should I use RJ11 or RJ45 connectors? Both will work with RJ11 connectors and CBL03 cables. 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. Shipping cost will be calculated during checkout. Both boards support the Modbus protocol and Laurel’s Custom ASCII protocol, as well as half-duplex or full-duplex RS485 communications. Designed to be used with the SenseCAP Sensor Hub, this splitter is able to "split" one MODBUS RS485 port into 4. The RS485 splitter has one male interface that connects to the Sensor Hub and four female interfaces that link to the sensors. It is made up of hardware products (sensors, data loggers, and gateways, for example), software services (SenseCAP portal, mobile App, open dashboard), and an API for system and data management.

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