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Pin
Parameter
Description
Pin 6
Primary RS-485 –
Running Modbus protocol at 19.2k baud, use this bus to connect to other Modbus Slave devices.
The DXM700 is a Modbus Master device on this RS-485 port.
Pin 7
Primary RS-485 +
Pin 13
Secondary RS-485 –
The DXM700 is a Modbus slave on this bus (see
Processor/Base Board Connections
on page 24).
Pin 14
Secondary RS-485 +
4.7 Modbus Master Port and Slave Port
There are two RS-485 ports on the DXM700, a Modbus master RS-485 port and a Modbus slave RS-485 port.
The Modbus master RS-485 is controlled by the DXM700, which acts as the Modbus master. All wired devices connected
to the master RS-485 port must be slave devices.
The Modbus slave RS-485 port is controlled by another Modbus master device, not the DXM700. The slave port is used by
other devices that want to access the DXM700 as a Modbus slave device. All local registers are available to be read or
written from this slave port. Set the Modbus Slave ID for the secondary RS-485 port using the LCD display menu: System >
DXM Slave ID.
4.7.1 Modbus Master and Slave Port Settings
The basic communications parameters for the RS-485 ports are set in the DXM Configuration Tool and are saved in the
XML configuration file. All basic settings are available under Settings > General screen of the DXM Configuration Tool.
Master port parameters include:
• Baud rate and parity
• Set the Communications Timeout parameter to cover the expected time for messages to be sent throughout the
wireless network. For the DXM700, the Communications Timeout parameter is the maximum amount of time the
DXM700 should wait after a request is sent until the response message is received from the Modbus slave device.
• Maximum Polling Rate sets the minimum wait time from the end of a Modbus transaction to the beginning of the
next Modbus transaction.
Figure 14. Settings > General screen
The Modbus Slave port settings include:
• Baud rate and parity (also set on this screen)
Sure Cross
®
DXM700-Bx Wireless Controller
30
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