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The most commonly used models of the Rosemount Hart 475 handheld communicator are: Rosemount Handheld Communicator 475HP1ENA9GM9, 475HP1ENA9GMT (basic model); Rosemount Handheld Communicator 475HP1ENAUGM9, 475HP1ENAUGMT (with 3-year upgrade option); Rosemount Handheld Communicator 475HP1EKL9GM9, 475HP1EKL9GMT (explosion-proof version); Rosemount Handheld Communicator 475HP1EKLUGM9, 475HP1EKLUGMT (explosion-proof version with 3-year upgrade option); Rosemount Handheld Communicator 475FP1EKLUGM9, 475FP1EKLUGMT (HART+FF protocol). Debugging steps: 1. Prepare the tools: 1.475 handheld communicator, 2. transmitter, 3. DC24V power supply, 4. 250-ohm resistor. Second, connect the transmitter to a 24V power supply and add series resistors. Hang the two hooks of the handle controller on the front and back of the resistor, respectively. Third, click the Power button on the handheld device to access the next level of menu; if it is the HART protocol, select the first HART pattern. 4. Press the Enler key to access the next menu level; select Online for an online connection. Then go to the next menu level and choose Overview for the online view. 5. Go to the next menu level and select UPPER RANGE VALUE for the upper limit range. Enter the desired range value. 6. Press the Tab key, then the ENTER key, select SEND, go to the sub-menu, click OK, and then click OK again. The upper range limit for the Rosemount 3051CD series has been set.