User manual

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Cooper Bussmann 245U-E Wireless Ethernet Modem & Device Server User Manual
43Rev Version 2.19
With the serial gateway server, client, and multicast functions it is possible for serial data from a 245U-E to be
transferred to any other 245U-E serial ports including the corresponding port on the same 245U-E.
Serial Gateway (Modbus RTU to TCP)
When configured as Modbus, the module will allow a serial Modbus client (master) to connect with a single Ethernet
Modbus TCP server (slave). With the Modbus function, the serial data is encapsulated within a TCP/IP data frame
and made available on the Ethernet network. Both 245U-E serial ports and the hard wired Ethernet port can be
configured to communicate completely separate data streams that can all be communicating at the same time.
Some of the possible serial gateway topologies are shown in Figure 40.
Figure 40 Serial Gateway
There are software packages available (such as SerialIP Redirector by Tactical Software) that can create a virtual
serial port on a PC. This virtual serial port can be configured to connect to a 245U-E serial port. Standard programs
can then be used to access this serial port as if it were actually connected to the PC. Alternatively, HyperTerminal
may be used to connect to a serial port on the 245U-E. When creating the HyperTerminal connection, select
“Connect Using: TCP IP (Winsock),” enter the IP address of the 245U-E and the port selected in the “Network port”
field.
Modbus TCP to RTU Gateway
The Modbus TCP to RTU gateway allows an Ethernet Modbus/TCP client (master) to communicate with a serial
Modbus RTU slave. The 245U-E makes this possible by internally performing the necessary protocol conversion.
The conversion is always performed by the 245U-E which is directly connected to the Modbus serial device, only
this module needs to have Modbus TCP to RTU gateway enabled.