Magnetrol Jupiter JM4 Operating Manual page 50

Ensure that the Terminal application is receiving responses from the HMA and that there
14.4.37
are no communication errors being reported. The Receive buffer section should have the
same number of responses as the Transmit buffer section.
If unable to establish communication in the HART over RS-485 mode, the HMA can be
14.4.38
reset to the default Modbus RTU operating mode by switching DIP switch 1 to OFF. The
HMA will switch to the default communication mode. Using Procedure 1, set register
3008 to 0. The HMA can be used either in that mode, or by setting DIP switch 1 to ON it
can be used in its normal Modbus configuration mode.
50
41-621.1 HART ® to Modbus ® Adaptor Operating Manual