Modbus Output Register
Turn on or turn off the voltage output. If both outputs 505 and 506 are turned on at the same time but are set to
different voltages, the output voltage is 5 V for DXM100-B1 models and set to the lower voltage setting for
DXM100-B2 models.
6.2.2 Associating a Switched Power Output to an Input
Switched power 1 and 2 (pins 30 and 21) can be associated to any Universal input to apply power a sensor, take a
reading, and then remove power from the sensor. This conserves power in battery-operated systems.
The switched power supply can be used in one of two different ways: supplying courtesy power to an output pin or
associated to an input. (Only one method can be active at a time.)
Use the following configuration parameters to define the courtesy power supplied to a switched power output pin.
Courtesy Power Output Configuration Parameters 5
Modbus Registers
Switched Power 1
Switched Power 2
Switched Power Enable
2201
2251
Voltage
3601
3621
Default Output
3602
3622
Output Register
505
506
Default Output
Set the register value to 1 for continuous power. The default setting is 0.
Cycle power if this register value is changed.
Switched Power Enable
Enables the switched power supply. Set to 1 to enable; set to 0 to disable.
This does not enable the supply output to the actual output pin. To enable the supply output to the output pin, set
Modbus register 505 or 506 to 1. Set to 0 when associating the switched power supply to an input.
Output Register
Write to the Output register to turn on or turn off the voltage output.
If both Output Registers 505 and 506 are turned on at the same time, but are set to different voltages, the output
voltage is 5 V for DXM100-B1 models and set to the lower voltage setting for DXM100-B2 models.
Voltage
For the B1 and S1 models, set the Modbus register value to 0 for a switched power supply at 5 volts. Se the
Modbus register value to 1 for a switched power supply at 16 volts.
For the B2 and S2 models, set one of the following register values to select your switched power output voltage.
For 5 V, set the Modbus register to 204.
For 7 V, set the Modbus register to 125.
For 10 V, set the Modbus register to 69.
For 15 V, set the Modbus register to 32.
For 20 V, set the Modbus register to 12.
For 24 V, set the Modbus register to 3.
When associating a switched power supply to an input, set the Switch Power Output Enable register to off (0). Set
Modbus register 2201 for switched power 1 and Modbus register 2251 for switched power 2. This allows the input sampling
mechanism to control the output.
Use the following configuration parameters to define the switch power associated with an input.
Input Parameter
Universal Input Configuration Parameter Modbus Registers
Universal Input 1
Universal Input 2
Universal Input 3
Universal Input 4
Input Enable
1001
1051
1101
1151
Sample Interval (high)
1002
1052
1102
1152
Sample Interval (low)
1003
1053
1103
1153
Switched Power Enable
Mask
1004
1054
1104
1154
5 Only used when supply courtesy power to the output pin, not when associating switched power to an input.
DXM100-Bx Wireless Controller Instruction Manual
38
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