 
									
									8-Port RS-232/422/485 serial communications board
DNx-SL-508
 
									
									4-port, RS-232/422/485 serial communications board
DNx-SL-501
 
									
									4-port, synchronous serial communications, HDLC, and SDLC protocol support
DNx-SL-504
 
									
									4-port, RS-232/422/485 serial communications board 4mbs
DNx-SL-501-804
 
					 
									
									 
									
									 
									
									 
									
									 
									
									 
									
									 
									
									