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Hart communication with AD5700 and AD5421



		

			

									
					    Pankajkjain
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jan 8, 2014 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi Sir/Madam,
    
 
    I am newbie in this field.
    
 
    I have two AD5700 hart modem, I connected it with AD5421. signal output of AD5700 is very good 1.2 and 2.2 Khz sin wave frequency fed to Cin of AD5421, but the output of the AD5421 is fix 1.2 KHz (approx)  freq seen by oscilloscope with much noise. 
    
 
    When I connected output to Hart modem for receive signal it give garbage only.
    
 
    my baudrate is 1200 for communication.
    
 
    Please help to solve the problem.
    
 
    Thanks,
    
 
    Pankaj 
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 4-20mA Current Loop D/A Converters
                
                                                    
                 HART Interface Solutions
                
                                                    
                 ad5421
                
                                                    
                 ad5700
                
                                                    
                 Precision D/A Converters
                
                                        
                                            
                
                
                                
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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Feb 4, 2014 9:18 AM
            
            
					
      
	
      

		
		
      
					
      Hi Pankaj,
      
 
      Apologies for the delay in getting back to you - I only got notification about this Engineer Zone post today. 
      
 
      You are welcome to contact me directly and share your schematic such that I will be able to resolve your issue more efficiently?
      
 
      Best Regards,
      
 
      Tracey...
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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                on Feb 3, 2025 9:05 AM
            
            
												
						in reply to tjohnson
					
									
        
	
        

		
		
        
					
        Hello Johnson,
        

        I am facing same issue. We are monitoring RXD data coming form MODEM and seeing continuous garbage bytes coming in. Causing trouble to decode actual response coming from HART transmitter. Will you please share your contact details to share more information on this topic or else share the resolution link or document if any.
        

        

        Waiting for your quick response..
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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                on Feb 3, 2025 9:05 AM
            
            
												
						in reply to tjohnson
					
									
          
	
          

		
		
          
					
          Hello Johnson,
          

          I am facing same issue. We are monitoring RXD data coming form MODEM and seeing continuous garbage bytes coming in. Causing trouble to decode actual response coming from HART transmitter. Will you please share your contact details to share more information on this topic or else share the resolution link or document if any.
          

          

          Waiting for your quick response..
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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