|   Features 
Compact, using DB9 connector, with a terminal.  
Compatible with RS232, RS-485 TIA/EIA standards.  
Automatic send / receive data without external flow control signals (RTS)  
Power Supply: a unique serial charge pump drive technology, no external power supply, the real three-wire (TXD.RXD.GND) system for communications, does not need to initialize the serial port.   
Be able to connect up to 32 network devices  
Communication Distance: 1,200 meters  
Communication Speed: 300BPS-115.2KBPS.  
Transmission Media: twisted pair or shielded cable 
Working Mode: asynchronous full-duplex (RS-422)  
Used for all communication software, plug and play.   
Dimensions: 63mm × 33mm × 17mm   
Operating Environment: -20 Degrees Celsius ~ 70 Degrees Celsius 
Relative humidity: 5% ~ 95%     
Support DOS/WIN95/WIN98/WIN2000/NT/XP/Linux, etc. 
                  
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