4.2.1 Connecting a Battery
When attaching a battery to the DXM100 as a backup battery or as a solar battery, verify the charging algorithm is set
properly. The factory default setting for the battery charging algorithm assumes you are using 12 to 30 V DC to recharge the
battery.
The charging algorithm is designed to work with a sealed lead acid (SLA) battery only.
•
When using 12 to 30 V DC, connect the 12 to 30 V DC + to pin 2 and connect the ground to pin 3.
•
When using main dc power with a back up battery (default configuration), connect the incoming main power pin 2 (+)
and to pin 3 (-). Connect the 12 V sealed lead acid battery to pin 4 (+) and pin 5 (-). The incoming main power must
be 15 to 30 V dc to charge the battery.
4.2.2 Supplying Power from a Solar Panel
To power the DXM100-Sx 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 configuration 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 configuration.
The battery charging configuration defaults to a battery backup configuration. To change the charging configuration from the
menu system:
1. From the DXM100 LCD menu, navigate to
System Config
>
I/O Board
>
Charger
.
2. Select
Solar
for solar panel configurations or
DC
for battery backup configurations.
To change the charging configuration 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 configuration.
4.3 Connecting the Communication Pins
The base board communications connection for external Modbus device uses the primary RS-485.
RS-485
. The primary RS-485 bus is a common bus shared with the ISM radio board (Modbus Slave ID 1).
RS-232
. The RS-232 bus is not currently defined.
Pin
Parameter
Description
Pin 6
Primary RS-485 –
Use this bus to connect other Modbus Slave devices into the wireless network.
Modbus Register 6101 = Baud Rate
0 = 19.2k
1 = 9600
2 = 38400
Modbus Register 6103 = Parity
0 = no parity
1 = odd
2 = even
Pin 7
Primary RS-485 +
Pin 9
RS-232 Tx
Serial RS-232 connection. This bus must use a ground connection between devices to operate
correctly.
Pin 10
RS-232 Rx
Pin 13
Secondary RS-485 –
Not used
Pin 14
Secondary RS-485 +
Pin 15
CANL –
Pin 16
CANH +
4.4 Inputs and Outputs
The I/O base board is a Modbus slave device that communicates using Modbus commands. Refer to the Modbus Registers
section for more descriptions of each Modbus register on the DXM100-Sx Modbus Slave.
4.4.1 Universal Inputs
The universal inputs on the DXM100-Sx Modbus Slave can be programmed to accept several different types of inputs:
Sure Cross
®
DXM100-Sx Wireless Modbus Slave
18
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