SST Automation GT200-HT-RS, User Manual

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3.3.2 Modbus Address Setting Button
Under run mode of the GT200-HT-RS, LED display always displays the address of the current Modbus
address. Quickly press (double-click) the button twice in succession, the high bit starts to flash, and the low bit is
always on, click the button to add 1 to start setting the high bit of Modbus address. Long-press the button for 3
seconds, the high bit is always on, and the low bit starts to flash. Click the button to add 1 to start setting the low
bit of Modbus address. At last, long-press the button again for 3 seconds, the address flashing three times shows
that the address is set successfully. If no button action within ten seconds, GT200-HT-RS exits the status of setting
address and continue to display the original address. The configurable range of Modbus address is 0 to 99
(Decimal).
3.3.3 Internal/External Sampling Resistor Switch
GT200-HT-RS can choose using the internal sampling resistor or external sampling resistor to get the HART
signal. The specification of the internal resistor is 270Ω, 2W. When the power of the sampling resistor is more
than 2W, you must use an external resistor.
Switch to ON, using the internal
sampling resistor
Switch to OFF, using the external
sampling resistor