Rs485 Cable Shortcuts - The straightforward Approach > 자유게시판

All the other Master Bricks with RS485 Extension must not have a USB, Ethernet or WIFI connection (they can use a USB Power Supply). Most newer consumer electronics comes with an USB, Firewire or other high-speed communication port, however a lot of industrial and commercial equipment, both old and new, is made only with a RS485 or RS422 serial communications port. Pin 1 and 6 however are reassigned to the A and B lines when the port is used in RS485 mode. Ensure power and data lines are connected properly and there are no loose connections. Confirm hardware connections including serial port devices, and check if your gateway and energy meter are correctly connected. The RS232 - RS422 converter is also often used in older serial devices such as older PLC's and terminal equipment. This module is powered by the RS232 port from the connecting computer. This is a method for connecting multiple RS485 devices with each other over a two-wire network.

2. Configure the IP of your RS485 and your computer to the same network address but different node address IP. 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. 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. If you use a twisted pair cable, make sure to use the same twisted pair for A and B, but use another twisted pair for GND. 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. 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. 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.

A Modbus RS485 connects a Master device to one or more Slave devices. The RS485 converter interface uses two wires for communication, one for transmitting and one for receiving data, which is referred to as a half-duplex communication converter. Some of these converters can convert from RS232 to both RS485 and RS422 however many standard models only has one of the protocols. So in order to transfer data from a RS232 serial interface engineers need a converter to be able to connect to a RS485 or RS422 interface. The advantage of the RS485 protocol is that this it can transfer data over longer distances, up to 4000 feet, and have up to 32 nodes per single network, and it can be used for multi-point networks where multiple serial devices are setup in a bus network. RS485 interface gives some more benefits compared to RS232: simplicity and the robustness for long distance transfer. A RS232 - RS485 converter is often used in industrial data acquisition and control applications where multiple serial devices communicate with each other through a converter.

However since only a true RS485 network can have addressable serial RS485 devices, the RS232 converter needs to be addressable either by software or by DIP switches when using it in this type of configuration. 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 foreword to the standard references The Telecommunications Systems Bulletin TSB-89 which contains application guidelines, rs485 cable including data signaling rate vs. 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. Ensure SSCOM is added to the firewall, otherwise the firewall may block TCP connections, or test by temporarily disabling all firewalls on the computer. Display and configure video; control PTZ; test cables, audio, IP network connections, PoE voltage; and power 12VDC cameras. The TESTER-CCTVPOE-P Professional CCTV Tester with Power Over Ethernet (PoE) and IP Testing is a portable, multifunction tester for CCTV installations and maintenance.