RS485 converter which aspects need to pay attention to the choose and buy?

RS485 communication methods widely used in weak current engineering, such as security monitoring, intelligent parking lot, intelligent buildings, RS485 is lower cost on one hand, on the one hand is its wiring is simple.But need to pay attention to several aspects when laid of RS485 bus, otherwise it is easy to cause the communication fault, to rule out it is very difficult.The RS485 bus laid we all need to pay attention to what aspects?

1. Pay attention to the quality of converter

RS485 with computer through a serial port connection, but there are some computers are no serial port (especially the converter), so we need to buy serial converter is generally.Buy time to pay attention to the quality of converter brand, though their function is similar, but the performance gap is very big, quality of converter is one of the causes of communication failures, the pay special attention to.

2. Pay attention to the communication distance is too long to

RS485 transmission distance are theoretically can transmit 1200 meters, but in practice, some factors such as quality of wire rod, installation environment, such as the controller performance will affect the transmission distance, in order to guarantee the stability of communication, communication distance general requirements within the 500 to 800 meters, more than will consider installing 485 Repeaters, extend the transmission distance.

3. About the use of passive converter

if RS485 is used in access control security system, we recommend that you do not use passive here converter.Transformation because of the passive communication quality is poorer, short communication distance and load capacity is poor, no anti interference ability, will cause the communication is not stable.We suggest that you should purchase normal manufacturer 485 converter, because these converters generally through rigorous testing, performance parameters are stable, compatibility.(for starters: http://www.nthuanli.cn/.