DFM 6.1 INSTRUCTION MANUAL 
 
20 
COMMUNICATION (Optional) 
 
Press  or  to position curser at Communication, and  to enter. Use  or  
to position cursor before each menu item and  to enter. When settings are 
completed press   to store and  again to return to the Main Menu. 
 
MODBUS Protocol Information: 
 
Transceiver:  2-wire, half-duplex  
Data format:  8 Data Bits 
Floating Point Byte Order:  ABCD 
Termination: 
Jumper JP1 selectable 120Ω resistor. TB1 & TB2 = OFF, 
TB2 & TB3 = ON  
Biasing:  None 
 
 
   
HART® (Highway Addressable Remote Transducer) Protocol Information: 
 
HART Version:  7.0 
 
Device  
Description  
Files: 
 
DD files allow the user’s handheld HART communicator 
to fully configure the DFM 6.1 Pulsar Measurement 
provides DD files for the Emerson 475 Communicator. 
The files are included in the USB drive provided with 
your DFM 6.1 meter. You may also request the files from 
Pulsar Measurement by calling or emailing us at 
info@pulsarmeasurement.com.  
Warning: The DFM 6.1 and associated DDs are pending 
certification from the Fieldcomm Group. 
 
Connections:  HART Protocol uses a digital signal superimposed on 
the 4-20mA output. When the 4-20mA output of the 
DFM 6.1 is connected with a load resistor (230Ω to 
600Ω), the HART communicator can be connected on 
the loop in order to communicate. 
 
Protocol 
Choose MODBUS or HART.