USB to RS485 Converter

 
RS485 RS422 Serial Converter 

 
Serial Wireless RS485 RS422 Adapter

USB to RS485 2-wire Half-duplex adapter 

Serial to Ethernet

Serial to USB For lndustrial Routers  

Serial to USB For lndustrial  Gateways

Serial Wireless RS485 RS422 Adapter

USB to RS485 2-wire, Half-duplex adapter 

DB9 male connector and supports baud rates from 300 to 1M baud. 

The USB interface is 1.1 and 2.0 compatible and uses the FTDI high speed serial to USB chip.

The basic communication mechanism of RS485 and RS232 is the same, and its advantage lies in making up for the shortcoming of RS232 communication distance, which cannot carry out network management of multiple devices at the same time.

The computer connects multiple 485 devices (access control controllers) in turn through the RS232 RS485 converter, and uses the polling method to communicate with the devices on the bus in turn.

The wiring marks are 485+ 485-, which correspond to 485+ 485- of the linking device (controller) respectively.

Communication distance: The theoretical distance between the farthest device (controller) and the computer is 1200 meters. It is recommended that customers control it within 800 meters, and the best effect can be controlled within 300 meters.

If the distance is too long, you can purchase an rs485 repeater, and an rs485 extender can extend to 3000 meters.

The number of loads: that is, how many devices can a 485 bus carry, which depends on the selection of the communication chip of the controller and the communication chip of the 485 converter. Generally, there are 32, 64, 128, and 256 options.

This is a theoretical figure. In practical application, the number of loads cannot reach the target number according to factors such as the on-site environment and communication distance.

The 485 communication bus must use twisted pair, or one of the network cables. If ordinary wires are used without twisted pairs, the interference will be very large, and the communication will not be smooth or even communication.

Each controller device must be chained hand in hand, no star connection or bifurcation is allowed. If there is a star connection or fork, the interference will be very large, the communication will be poor, or even the communication will not be possible.