Pin
Description
Pin 35, Pin 45
These outputs are controlled by hardware jumpers.
Jumper 2 is the power jumper for pin 45. Jumper 1 is the power jumper for pin 35. Refer to the wiring board for more
information.
•
The pin 45 jumper selects 2.7 V when in the "a" position and 12 V battery in the "b" position.
•
The pin 35 jumper selects 4.2 V when in the "a" position and device power on pin 2 in the "b" position.
Pin 23, Pin 26
Courtesy power output from either the input power from pin 2 or the battery power from pin 4.
5.2.1 Supplying Power from a Solar Panel
To power the DXM150-Sx Wireless Modbus Slave from a 12 V dc solar panel, connect the solar panel to power pins 2(+)
and 3(-). Connect a 12 V dc sealed lead acid (SLA) rechargeable battery to pins 4(+) and 5(-).
The factory default setting for the battery charging algorithm assumes you are using 12 to 30 V dc power to recharge the
battery. If the incoming power is from a solar panel, you must change the charging algorithm.
To change the charging algorithm from the menu system:
1. From the DXM Modbus Slave LCD menu, navigate to System Config > I/O Board > Charger.
2. Select Solar for solar panel configurations.
To change the charging algorithm by writing to Modbus register 6071 on the I/O base board (Slave ID 11):
1. Write a 0 to select the solar power charging algorithm.
Modbus Slave ID
Modbus Register
Description
11 *
6071
Battery backup charging algorithm.
0 = Battery is recharged from a solar panel
1 = Battery is recharged from 12 to 30 V dc (default)
The following power operating characteristics are stored in Modbus registers.
Battery voltage
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.
Battery charging current
The charging algorithm 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.
Incoming supply voltage
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.
On-board thermistor temperature
This register stores the on-board 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.
Modbus Slave ID
Modbus Register
Description
11 *
6081
Battery voltage (mV)
6082
Battery charging current (mA)
6083
Incoming supply voltage (mV) (solar or power supply)
6084
On-board thermistor temperature (
⁰
C)
* The Slave ID for the base board is set at the factory. This may be changed using the base board DIP switch settings.
DXM150-Sx Wireless Modbus Slave
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