29
Remote Port: 23
Remote Password: (UNDEFINED)
Remote User ID: (UNDEFINED)
Session Termination Character: 0x04 (or preferred)
User Database Settings
user database empty! (or add users and corresponding passwords and
privileges)
RawTCP Operation
In the typical RawTCP application (see Figure 7), the user has a need to
connect a network enabled software application to a remote serial device
over the LAN for standard operation of the device. To enable the soft-
ware application to communicate with the remote serial device, the
Model 2120 is usually assigned a static IP Address and the IP Address is
configured within the software application. When the software applica-
tion is launched, it sends data in TCP packets over the LAN to the IP
Address of the Model 2120. When received, the Model 2120 converts
the packets to asynchronous data and forwards the data to the device
connected to the serial interface. The serial device sends asynchronous
data back to the Model 2120 and the Model 2120 converts the data into
TCP packets and sends it over the LAN back to the originating location/
application to complete the cycle. In this type of application, the Raw-
TCP connection between the software application and Model 2120 is
configured so that is does not timeout/disconnect.
Note
Legacy software applications that are not network enabled will
require a Comm Port Redirector application to communicate
with the Model 2120 and the remote serial device over the LAN.
A Comm Port Redirector is used to map serial communication
ports to the IP address and port number of the 2120 connected
to the remote serial device. This application resides on the com-
puter hosting the legacy software application and basically tricks
the legacy application into packetizing the asynchronous data
into TCP packets and sending the data over the LAN to the IP
Address of the remote 2120/device, thus creating a transparent
serial connection.
