Product Description:  

       This product is a high-performance and multi-functional RS232-485 interface converter. This product is a passive converter with small size, long transmission distance, high speed, and stable performance. It is widely used in monitoring systems, attendance systems, and IC card charging systems. It is a cost-effective data conversion product. Supports 32/128 nodes.

The main function:

• Semi-bidirectional conversion of RS232 and 485 signals, one RS485 signal output
• Efficient power stealing, no external power supply required;
• Hot plugging, only RX and TX, serial port protection.

Technical Parameters:

• Speed ​​0-115200BPS
• RS485 transmission distance is 1200 meters (at 100kBPS)
• Working temperature -10 to 70 degrees
• RS485 port has the anti-static, anti-lightning design
• 128 nodes

Instructions:

•  The DB9 interface is an RS232 port, connected to the COM port of the system control port
•  (A), (B) are RS485 signal output ports, and connected to control equipment, such as a decoder. For RS485 communication, it is a half-duplex communication method
• The 485 interfaces of the most remote RS485 device of the output circuit is connected with a 120Ω resistor  in parallel, and one circuit is not more than  a 120Ω resistor
• The RS485 communication specification requires a shielded twisted pair connection. If parallel cables are used, the communication distance will be greatly reduced.           

Wiring Configuration: