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• Insulated Heat shrink covered PCB with FT232R chipset provides single chip USB to asynchronous serial data transfer interface. • USB bulk transfer mode. • Entire USB to RS485 translation protocol handled by the electronics in the cable. The transmission speed of RS485 cables can vary depending on factors such as cable length, baud rate, and the quality of the cable itself. You can connect the 120Ω matching resistance to the line by turning the 10th bit of the DIP switch to ON. Only when the 485 communication distance exceeds 300 meters, the terminal resistance should be added at the beginning and end of the 485 communication. 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. Carry a few converters with you so that you can rule out whether the quality of the converter is affecting the communication quality.

● The manufacturer will do a lot of testing work for its supporting 485 converter, and will require the 485 converter manufacturer to carry out production and quality testing according to its fixed performance parameters, so it has better compatibility with access control equipment. I just needed to figure out a way to mount it and make it work correctly. This way people can see several different options. So I had to devise of a way to determine if the sprinklers were running. When a BYTE is sent from a serial device (BACnet MSTP thermostat) to a USB to 232/485 converters (USB-COMI-SI-M) it is cached on the USB converter until one of two things happened. Don't be greedy to buy a 485 converter from a brand-name manufacturer at a low price. ● If there are too many loads, such as more than 30 units on a bus, what is rs485 cable it is recommended to use 485 HUB to solve the problem. ● 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.

Simply pull a line to the device alone, which can be used to rule out whether the wiring is causing the communication failure. Devices utilizing RS485 can communicate with central control systems using communication protocols such as Modbus and ASCII. In theatre and performance venues, RS-485 networks are used to control lighting and other systems using the DMX512 protocol. RS485 industry Standard use requirements, so when the distance between each device line is relatively long, it is easy to cause problems such as signal reflection and anti-interference ability, which leads to a decrease in the reliability of the control signal. In this capture we had our scope leads connected to the positive signal conductor and ground. Grounds between buildings may vary by a small voltage, but with very low impedance and hence the possibility of catastrophic currents - enough to melt signal cables, PCB traces, and transceiver devices. If it is normal, it indicates that the serial port of the customer's computer may be damaged or injured.

Converters between RS-485 and RS-232 are available to allow a personal computer to communicate with remote devices. In most cases, RS485-based devices can employ communication protocols such as Modbus and ASCII to establish communication with a central control system. 1. Ordinary twisted pair shielded cable STP-120Ω (for RS485 & CAN) one pair 20 AWG, the outer diameter of the cable is about 7.7mm. Suitable for indoor, pipeline and general industrial environment. Other elements like wire gauge, biasing circuit characteristics (impedance or capacitance), the existence of stubs from the main trunk, and the physical arrangement of your network cable can all affect your network’s maximum length.Take into account all these factors and maintain a buffer to stay within the advised limit for the overall max network cable length. 2. Ordinary twisted pair shielded cable STP-120Ω (for RS485 & CAN) one pair 18 AWG, the cable outer diameter is about 8.2mm. Suitable for indoor, pipeline and general industrial environment. 3. Armored twisted-pair shielded cable ASTP-120Ω (for RS485 & CAN) one pair 18 AWG, the outer diameter of the cable is about 12.3mm. It can be used in places with severe interference, frequent rodent damage, and lightning protection and explosion-proof requirements.