Intel NUC RS485 Cable for Expansion Panel > 자유게시판

Since the difference between my low water level and my normal water level is about three inches, this worked perfectly for me. First, make sure that the computer notebook you carry with you is a device with normal communication, and use it to replace the customer's computer for communication. In actual construction use, users often use star connection. 4) Why should the 485 bus adopt the hand-in-hand structure instead of the star structure? The star structure will produce reflected signals, which will affect the 485 communication. One of the effective ways to eliminate common-mode interference is to use the shielding layer of the 485 communication line as a ground wire, connect the equipment in the network such as machines, computers, etc., and connect them to the ground reliably from one point. The method to eliminate differential mode interference is to add a bias resistor (matching resistance in the dome camera) to the circuit, and use twisted-pair wires; common mode interference is transmitted between the signal line and the ground, which is asymmetrical interference. RS-485 cables typically have two twisted pairs of wires for differential signaling, allowing for greater immunity to electromagnetic interference. The communication line should be as far away as possible from interference sources such as high-voltage wires, fluorescent lamps, etc. When the communication line cannot be avoided from interference sources such as power lines, the communication line should be perpendicular to the power line, not parallel, and cannot be bundled together, and use high-quality twisted-pair cables.

● Use scientific and reserved solutions for 485 bus projects with long lines and heavy loads. 7) Under what circumstances should a terminal resistance be added to the 485 bus? Only when the 485 communication distance exceeds 300 meters, what is rs485 cable the terminal resistance should be added at the beginning and end of the 485 communication. 2) The common communication failures with 485 bus structure are as follows? RS485 is also commonly used for building automation as the simple wiring configuration and lengthy cable length are ideal for joining remote devices. RS-485 is also used in building automation as the simple bus wiring and long cable length is ideal for joining remote devices. The length of the branch line from the bus to each terminal device should be as short as possible, generally not exceeding 5 meters. 3) How should the 485 communication line be routed? Especially when the number of devices on the 485 bus is small. RS485 is used more industrially where many devices need to be interconnected together for a system. When the number of equipment is large (such as more than 22). Generally, there is no need to increase the terminal resistance, because the terminal resistance will reduce the load capacity of the 485 bus.

● On-site debugging with complete debugging equipment. The following debugging methods can be used according to the problems encountered. 3) What are the debugging methods for failure? This presented a problem in that if my sprinklers are running and I decide to fill the pool, I would be robbing whatever lawn zone was running water and it would not water the lawn properly. So I had to devise of a way to determine if the sprinklers were running. Serial communication is a way to send data. This way people can see several different options. ● Sometimes it can communicate, sometimes it can't communicate, some commands can be communicated, and some commands cannot be communicated. ● No communication, no response. ● The system prompts that there is interference during communication, or the communication indicator keeps flashing when not communicating. ● If the communication distance is too long, such as over 500 meters, it is recommended to use a repeater or 485 HUB to solve it. 485- of the last 485 device to improve the communication quality.

Carry a few converters with you so that you can rule out whether the quality of the converter is affecting the communication quality. Simply pull a line to the device alone, which can be used to rule out whether the wiring is causing the communication failure. It requires minimal wiring and can share the wiring among several seats, reducing weight. The provided circuit illustrates the fundamental connections for a two-wire wiring setup. In contrast to RS-422, which has a driver circuit which cannot be switched off, RS-485 drivers use three-state logic allowing individual transmitters to be deactivated. For on-site debugging, you must carry a few converters that can connect to long distances and multiple loads, a commonly used computer notebook, a multimeter to test the circuit break, and a few 120 ohm terminal resistors. ● Carry out construction strictly in accordance with the 485 bus construction specification to prevent any fluke. Use a wire or shielded wire to connect the GND ground of all 485 devices, so as to avoid the potential difference between all devices that affects communication. 1. Use shielded twisted pair wire and effectively ground it.