© Microhard Systems Inc. 62
4.0 WebUI Configuration
Protocol Config (continued)
WirelessBus Mode: WirelessBus Mode can be used in systems where serial based polled SCADA
systems such as Modbus have one master/host and multiple remote/slave RTU/PLC’s located at several
different locations. The IPn3G that is connected to the Master is provided a list of IP Addresses/ports of
IPn3G’s that are connected to each of the remotes. Several Modbus (or other serial based protocols), can
be connected to each of the remote IPn3G’s (Using RS485 for multi-drop etc). WirelessBus Mode supports
Modbus RTU, and Modbus ASCII modes, as well as other protocols using broadcast mode.
Image 4-29: COM1 > Wireless Bus Mode (Host/Server)
WirelessBus Mode uses UDP packets to communicate between the Host and the Remotes. When a IPn3G
is configured as a Host/Server it retains a list of ModbusID’s and the respective IP/Port information
required to communicate with any remotes. When a Modbus poll is received by the IPn3G it looks at the
Modbus ID, then assembles a UDP packet to be sent to the corresponding IP/Port listed in the table. At the
remote side, the packet is disassembled and sent out the remote serial port as original serial data.
Listening Port
This is the UDP port used by the IPn3G configured as a Host/Server to
listen for incoming traffic from remote devices using the WirelessBus mode
and set as Remote/Clients.
20009
Values (UDP)
Timeout
The IPn3G features a configurable timeout. This timeout checks to ensure
the specified port is open and ready.
30
Values (seconds)
Bus Mode
When set to Remote/Client, and data received on the serial port will
automatically be encapsulated into an UDP packet and sent to the
configured host IP. When set to Host/Server the IPn3G will encapsulate
data received on the serial port into a UDP packet and send to the
applicable IP addresses/Ports listed.
Remote/Client
Host/Server
Values (selection)
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