Maximum Analog Value
—The Maximum Analog Value register stores the maximum allowed analog value. The specific
units of measure apply to the register value. For example, the register may contain 20000, for 20 mA, or for a voltage output
the register may contain 8000, for 8 volts.
Minimum Analog Value
—The Minimum Analog Value register stores the minimum allowed analog value. The specific units
of measure apply to register value. For example, the register may contain 4000, for 4 mA, or for a voltage output the register
may contain 2000, for 2 volts.
5.2.5 Modbus Configuration Registers for the I/O (Definitions)
Enable Full Scale
Set to 1 to enable a linear range from 0 to 65535 for specified input range. For a 4 to 20 mA input, a value of 0
represents 4 mA and 65535 represents 20 mA. Set this parameter to 0 to store input readings in unit-specific data.
For example, the register data representing a 15.53 mA reading is 15530. For units of current (0 to 20 mA inputs),
values are stored as µA (micro Amps) and voltage values are stored as mV (millivolts).
Enable Rising/Falling
Use these registers to enable the universal input logic to count on a rising transition or a falling transition. Write a
one (1) to enable; write a zero (0) to disable.
High/Low Register for Counter
The low and high registers for the counter hold the 32-bit counter value. To erase the counter, write zeroes to both
registers. To preset a counter value, write that value to the appropriate register.
Hysteresis and Threshold
Threshold and hysteresis work together to establish the ON and OFF points of an analog input. The threshold
defines a trigger point or reporting threshold (ON point) for a sensor input. When the input value is higher than the
threshold, the input is ON. Hysteresis defines how far below the threshold the analog input is required to be before
the input is considered OFF. A typical hysteresis value is 10% to 20% of the unit’s range.
In the example shown, the input is considered on at 15 mA. To consider the input off at 13 mA, set the hysteresis to
2 mA. The input will be considered off when the value is 2 mA less than the threshold.
Threshold
ON point
Time
Input V
alue
Input
Hysteresis
OFF point
Input Type
Program the universal inputs to accept input types NPN, PNP, 10k thermistor, 0 to 10 V, 0 to 20 mA, or
potentiometer. The default setting is 8: NPN raw fast. To set the input type, write the following values to the Input
Type Modbus registers.
0 = NPN
1 = PNP
2 = 0 to 20 mA
3 = 0 to 10 V DC
4 = 10k Thermistor
5 = Potentiometer Sense (DXM150 only)
6 = Not used
7 = Bridge
8 = NPN Raw Fast (default)
Temperature °C/°F
Set to 1 to represent temperature units in degrees Fahrenheit, and set to 0 (default) to represent temperature units in
degrees Celsius.
5.2.6 Modbus Configuration Registers for Power
To monitor the input power characteristics of the DXM100, read the following power Modbus registers. The on-board
thermistor is not calibrated, but can be used as a non-precision temperature input.
Sure Cross
®
DXM100-Sx Wireless Modbus Slave
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