产品名称：BLACK BOX ME481C-232                                       
型号：ME481C-232                                    
品牌：BLACK BOX

描述：   
 Take advantage of the 4-Wire Campus Driver modular design  hook up 
RS-232, RS-422, RS-530, V.35, or X.21.
Simply select the appropriate you need now and then change them 
as your network changes. .