HY-817 RS232 to RS485/RS422 Industrial Interface Converter NO Power Photoelectric Isolation 
1.Compatible with RS-232C and RS-485 standards of EIA/TIA.
2.Automatic data transceiver without external volume control signal (RTS).   
3.Communication rate: 300BPS-115.2KBPS.
4.A maximum connection of 32 pieces of RS-485 or RS-232 interface devices.
5.Communication distance: 1.2 KM (9,600BPS).
6.Power indicator light and double-color data traffic indicator light available for malfunction  indication.
7.Working modes: applicable for both asynchronous half duplex (RS-485)
8.Photoelectric isolation (an isolation voltage as high as 2.5KVrms /500VDC isolation), 600W lightning strike and grounding interference protection for each RS-485 line.
9.Electric interface: DB9 female connectors for connection from RS-232C  and 10-port terminal for RS-485 interfaces.
10.Transmission media: twisted-pair cable or shielded cable.
11.Dimensions: 120mmX72mmX22mm
12.Working environment: -40 to 85degree, relative humidity 5% to 95%.
13.Plug-and-play and universally applicable on all the existing communication software and hardware interfaces.
14.Supporting DOS/WIN95/WIN98/WIN2000/NT/XP and Linux, etc.