Function: 1. Passive RS485 interface converter, equipped with anti-pinch protection circuit, with anti-overvoltage function. 2. Compared with similar passive products, this product can be used as RS-232 to RS-485 converter, RS-232 to RS-422 converter, and no jumper switching, just connect to the corresponding network connection mode, i.e. It can work adaptively. 3. The product complies with the RS-232, RS-485 and RS-422 standards. Ability to convert single-ended RS-232 signals to balanced RS-485 or RS-422 differential signals. 4. Widely used in handling machines, IC card charging systems, industrial automation control systems, access card control systems, parking lot systems, automated banking systems, bus fare collection systems, canteens for sale, highway systems, etc. 5. This product is compact and lightweight, easy to carry and easy to use. Specification : Item Type: Adapter Interface features: The interface complies with the EIA/TA RS232C and RS-485RS422 standards. Electrical interface: RS-232 interface is DB9 type connection port (female head); The RS4850Rs42 interface is a DB9 type (male head) connection port that can be connected to a small board and easily routed through a six position terminal on the small board. Transmission medium: RS485 uses a pair of twisted pairs (can be shielded, recommended twisted pair characteristic impedance is 1209); RS-422 uses two pairs of twisted pairs (can be shielded, it is recommended that the characteristic impedance of each pair of twisted pairs be 1209) Operating mode: RS-422 asynchronous full duplex; RS-485 asynchronous half-duplex Baud rate: 300-115200b0s Transmission distance: approx. 0-800 meters / 0-2625 feet Size: Approx. 55 x 35 x 15mm / 2.2v 1.4 x 0.6in Working environment: 0°C - 70°C Relative humidity: 5% - 95% Possibility of cascading: 16-32 devices Maximum allowable device differential pressure at both ends: 5.7 V Package List: 1 adapter