产品名称：BLACK BOX ME800A-R4                                                              
型号：ME800A-R4                                                                             
品牌：BLACK BOX

描述：   
Ideal for point-of-sale application.
RS-232 up to 4 miles (6.4 km), at 9600 bps, over 4-wire 
connection.
The ME800A-R4 is backwards compatible with the ME800A-R3.
规格：
At a maximum speed of 115.2-kbps you can go up to 4000 feet.
Must be used in pairs.
RS-232 is the most common erial interface in use today. This means you 
can use your SHM–C in RS-232 installation—industrial application;
UNIX?, DEC2, and HP? workstation connectivity; and more.
Choose our 4-Wire SHM–C Async to  data up to 4 miles (6.4 km). Run
loopback tests simply by pressing a front-panel button. Open the flip-top 
lid for quick DTE/DCE selection.
Transformer and optical isolation protect your data from electrical 
interference.