Table 6: Configuration registers for power
Modbus Register
Description
6071
Battery backup charging algorithm.
0 = Battery is recharged from a solar panel
1 = Battery is recharged from 12 to 30 V DC (default)
6081
Battery voltage (mV). If no battery is present, the value in this register is less than 5 V. If the value in this register is greater than
the incoming voltage register, the battery is powering the system.
6082
Battery charging current (mA). The charging configuration charges the battery when the incoming voltage register value is greater
than the battery voltage register value. This registers shows the charging current in milliamps.
6083
Incoming supply voltage (mV) (solar or power supply). The incoming power can be from a solar panel or from a power supply.
The battery is charging when the incoming voltage register value is greater than the battery voltage register value. The battery is
powering the system when the incoming voltage register value is less than the battery voltage register value.
6084
On-board thermistor temperature (⁰C). A thermistor measures the temperature of the solar controller board and its surrounding
area and uses the temperature as part of the battery charge calculations. This register stores the thermistor reading in tenths of
degrees C. This is not a calibrated input: divide by 10 to calculate the temperature in degrees C. For calibrated temperature
inputs, define one of the universal inputs as a temperature input.
5.3 Using Courtesy Power or Switch Power
Pin 18 of the DXM100-Sx Modbus Slave is a constant power source that supplies 5 volts up to 500 mA.
Pins 21 (switch power 2) and 30 (switch power 1) are switched power outputs. Configure the switched power outputs using
Modbus registers or by using the DXM Configuration Software's
Settings
>
I/O Board
screen. The output voltage can be
selected and is controlled using a Modbus register on the I/O board (Modbus slave ID 200). The voltage options are:
•
5 volts or 16 volts for DXM100-B1 models; or
•
5 to 24 V dc for DXM100-B2 models.
Turn the switched power on or off using the output register 505 for switch power 1 or 506 for switch power 2. For continuous
power, set the Default Output register to 1, then cycle the power.
Switch
Power
Enable
Register Enable Register Value
Voltage
Register
Voltage Register Value
Default
Output
Registe
r
Output
Registe
r
1 (pin 30)
2201
Write a 0 to turn OFF
Write a 1 to turn ON (default)
3601
Write a 0 to select 5 V (default)
Write a 1 to select 16 V
Write a __ to select 24 V (DXM100-B2 model only)
3602
505
2 (pin 21)
2251
3621
3622
506
Enable Register
Configuration registers that turn on the ability to use the switched power output.
Default setting = ON
Voltage Register
Configuration registers that define the output voltage to the switched power output.
Default setting = 5 V
Default Output Register
Configuration registers that turn on the switched power outputs for continuous power out.
Set register to 1 for continuous power. Cycle power if this register is changed.
Default setting = 0
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.
5.4 Associating a Switched Power Output to an Input
Use the DXM Configuration Software to associate a switched power output to a universal input.
Sure Cross
®
DXM100-Sx Wireless Modbus Slave
30
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