High quality RS232 to RS485 Transmitter Converter Communication Data Adapter. 
Bi-direction connectors conver of this converter is mainly used between main controllers. 
RS232 to RS485 Converter can transfer the TXD and RXD signals of RS-232 interface and at the same time, after 7 pin's requirement of sending RTS, 4 pins data terminal prepares DTR to help supplying this converter. 
RS232 Converter automatically process control make you need to reset and make an easy application of the hardware and software installation.

Specifications:
Serial port feature: concurrently compatible with RS-232, RS-485 standard of EIA/TIA. 
Electric interface: DB9 hole interface of RS-232 end, DB9 pin connector of RS-485 end, compatible with post (5 connection). 
Work methods: asynchronous half duplex. 
Transmission media: common wire, double wire or UTP or shielding line. 
Transmission speed: 300~115~21BDS. 
Transmission distance: 5 meters(RS-232 end) 1.200 meters(RS-485 end). 
Telecommunication agreement: transparent. 
RS232 Adapter work environment: -10 degree Celsius to 85 degree Celsius, relative humidity: 5% to 95%. 
RS485 Converter signals: RS-232: TXD, RXD, RTS, CTS, DTR, DSR, DCD, CND; RS-485; Data+, Date-. GND. 
Size: ~9.2 x 3.2 x 1.7cm