Reset Code
Definition
3
Brownout
4
Watchdog
5
User
6
Software
7
Return from backup mode
4.5 Applying Power to the DXM700-Bx Wireless Controller
Apply power to the DXM700-Bx Wireless Controller using 12 to 30 V DC.
Pin
Description
1, 9
Power in at 12 V DC to 30 V DC
2, 10, 13, 14
Ground
4.6 Connecting the Communication Pins
The base board communications connections to the DXM are RS-485 (primary) and RS-485 (secondary).
RS-485
—The DXM is defined as the Modbus Master on this bus. Other internal Modbus slaves include the local processor
registers (Modbus Slave ID 199) and the display board (Modbus Slave ID 201). When assigning Modbus Slave IDs to
externally connected devices, only use IDs 2 through 190.
Pin
Parameter
Description
Pin 3
Primary RS-485 –
Running Modbus protocol at 19.2k baud, use this bus to connect to other Modbus Slave devices.
The DXM is a Modbus Master device on this RS-485 port.
Pin 4
Primary RS-485 +
Pin 11
Secondary RS-485 –
The DXM is a Modbus slave on this bus (see
Processor/Base Board Connections
on p. 24).
Pin 12
Secondary RS-485 +
4.7 Modbus RTU Master and Slave Ports
The DXM can be a Modbus RTU master device to other slave devices and can be a Modbus slave device to another Modbus
RTU master. The DXM uses the primary RS-485 port (M+/M-) as a Modbus RTU master to control external slave devices. All
wired devices connected to the master RS-485 port must be slave devices.
•
As a Modbus RTU master device, the DXM controls external slaves connected to the primary RS-485 port, the local
ISM radio, local I/O base board, and the local display board.
•
As a Modbus RTU slave device, the DXM local registers can be read from or written to by another Modbus RTU
master device.
The secondary port (S+/S-) is the Modbus RTU slave connection. The secondary (slave) Modbus RS-485 port (S+/S-) is
controlled by another Modbus master device, not the DXM. The slave port is used by an external Modbus master device that
will access the DXM as a Modbus slave device.
Use the configuration software to define operational settings for both the Modbus RTU master port and the Modbus RTU
slave port.
Use the DXM's LCD menu to set the Modbus Slave ID for the secondary RS-485 port.
Sure Cross
®
DXM700-Bx Wireless Controller
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