User's Manual

Elpro Technologies 450U-E Wireless Ethernet Modem & Device Server User Manual
34 www.cooperbussmann.com/wirelessresources Rev Version 1.4.0
Serial Gateway
Port Type
Select Serial Gateway from the drop down list.
Data Rate
Serial Data Rate will need to be configured to match that of the serial device that is connected
and communicating via the port. Baud rates available from 110 to 230400 baud.
Data Format
Serial Data Format defines the number of data bits, parity and start/stop bits that is used to
communicate with the serial device.
Flow Control
Flow Control is used by some serial devices to regulate the flow of data by turning on/off flags
that are used to tell the connected serial devices to start or stop transmitting data. The RS232
supports CTC/RTS hardware flow control.
Serial Gateway
Mode
Server When configured as a Server the modem will wait for a TCP connection to be

initiated by a remote Client.
Client When configured as a Client the modem will automatically attempt to connect

to a specific remote server that matches the configured Device IP Address and Port
Character Timeout
Enter the maximum delay (in msec) between receiving the last serial character on the serial port
and the radio transmitting the whole packet. Data will be sent when this time is exceeded.
Packet Size
The Maximum number of received bytes that will be buffered before the packet is sent. Data will
be sent when packet size is exceeded.
Listen Port
Only available when Server is selected in the Serial Gateway Mode. Enter a TCP Port
number on which the Server must listen for incoming connections. Default will be 24
Remote Device
Port
Only available when Client is selected in the Serial Gateway Mode. Enter the TCP Port
number configured on the Listen Port of the remote Server. Default will be 24
Remote Device IP
Address
Only available when Client is selected in the Serial Gateway Mode. Enter the IP Address of
the remote Server you wish to communicate with.
Save Changes and
Activate
Save changes to non-volatile memory and activate the process
Modbus TCP/RTU Converter
The Modbus TCP/RTU Converter allows an Ethernet Modbus TCP Client (Master) to communicate with a serial Modbus
RTU Slave. The 450U-E makes this possible by internally performing the necessary protocol conversion. The conversion
is always performed by the 450U-E which is directly connected to the Modbus serial device (i.e. only this module needs to
have the Modbus TCP/RTU Conversion enabled).
Figure 35 - Modbus TCP/RTU demonstrates how a Modbus/TCP Client (Master)
can connect to one or more Modbus RTU Slave devices. In this example the
450U-E Access Point is configured with the RS232 serial port set
TCP/RTU Converter When using this Port Type the module converts the
Modbus/TCP query from the Client into a Modbus RTU frame and forwards it
out the appropriate serial port to the Slave device. When the serial device
responds the query is received on the serial port, it is then converted into a
Modbus/TCP response and forwarded via the network to the
Modbus/TCP Client.
The Modbus TCP/RTU Converter may be configured to operate on either the RS-232 or RS-485 port.
Port Type
Select Modbus TCP/RTU Converter from the drop down list.
Data Rate
Serial Data Rate will need to be configured to match that of the serial device that is connected and
communicating via the port. Baud rates available from 110 to 230400 baud.
Data Format
Serial Data Format defines the number of data bits, parity and start/stop bits that is used to
Figure 35 - Modbus TCP/RTU Converter