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It shouldn’t however be a surprise that the pin assignment on the RJ11 socket on Unitronics PLCs is different from the two systems mentioned above. The Jazz PLC series from Unitronics are not standard equipped with a RJ11 connector for serial communications. The probes communicate using the standard Modbus RTU protocol. 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. 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. Two Tibbo Project System (TPS), Gen. 2-compatible Tibbo BASIC applications for the setup and testing of Bus Probes are available: BP-Tester-UI and BP-Tester-Web. Bus Probes are very compact (measuring only 40x36mm externally) and sport an attractive look and feel. Bus Probes can be configured and tested using our web-based test app (you will need to connect the probes to your PC or Android smartphone via our Web485 board).

Using a repeater, the main cable is divided into different segments, each of which can be up to 700 m in length and connect 32 devices (this number includes the repeaters). The maximum number of devices that can be connected to a main cable is 32, including the Master. This means that the master has to grand the slave permission to send. The wide supply voltage range also means that you can allow for a significant voltage drop along the bus (e.g., when using a bus cable of considerable length). RS485 is simpler because it uses only two wire (or a single pair) to carry out the data in bidirectional manner, using RS232, we need 3 wires at minimum to carry the data bidirectionally. Two wire telephone cables will not function because in that case the ground signal levels on both sides will be floating. Longer branches could cause signal reflections and generate disturbances and consequent errors in the reception of data. In order to avoid errors when many devices are connected, cables of the same colour should be used for all the connections to the terminals A and cables of the same colour should be used for all the connections to the terminals B of the various devices (e.g. white for A and blue for B).

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. The USB to RS485 Converter is designed to make serial port expansion quick and simple. USB to RS485 Converter ใช้ต่อกับ USB port ของ PC หรือ Note Book แปลงเป็นสัญญาณ RS485 Communication. USB Serial - The ANC-6204 multi-interface USB adapter provides RS232, RS422/485 or TTL/CMOS in one converter. The RS485 system used for Modbus communication provides a main cable (Bus or backbone), to which all the devices have to be connected with branches (also known as stubs) that are as short as possible.

Normally, this connection is made at one end of the main cable. Now you can stock just one adapter to fill all your legacy "RS" serial interfacing plus provide a low level TTL control interface. You can easily connect more devices by splitting the cable at one connector and adding another cable to it. The existence of an RS485 port on the socket makes it even a little bit more difficult. These ports use an RJ11 socket as physical connector. PCs are normally not equipped with an RJ11 socket for serial RS232 communications. In RS232 mode all pins are used for RS232 signals. The central four pins remain their original RS232 functionality. The actual functionality is determined by DIP-switches on the mainboard of the PLC. On some PLC models it is possible to mix RS232 and RS485 communications. The circuit uses optical isolation (opto-coupler) to isolate your RS232 port from the RS485 cables. The data COM port on the base of the Solis inverter uses a small round 4-pin plug with a screw thread to hold it in place when connected. In some countries, inserting two cables into the same screw terminal is permitted.

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