Digi ConnectPort X4 User's Guide download pdf (Page 143)

Configuration through the web interface

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TCP Sockets profile

The TCP Sockets profile allows serial devices to communicate over a TCP network. The TCP

Server allows other network devices to initiate a TCP connection to the serial device attached to

the serial port of the Digi device.

Automatic TCP connections (autoconnection)

The TCP Client allows the Digi device to automatically establish a TCP connection to an

application or a network, known as autoconnection. Autoconnection is enabled through the TCP

Sockets profile’s setting labeled Automatically establish TCP connections.

When the TCP

Sockets profile is set, the DTR flow-control signal indicates when a TCP socket connection has

been established. This information can be useful in monitoring the serial line and using it as a flow-

control mechanism to determine when the Digi device is connected to a remote device with which

communication is being established. This mechanism can be combined with using the DCD signal

to close the connection and the DSR signal to do RCI over serial. Together, these signals can be

used to make the Digi device auto connect to many devices, deterministically, on the network.

RFC 2217 support

Digi devices support RFC 2217, an extension of the Telnet protocol used to access serial devices

over the network. RFC 2217 implementations enable applications to set the parameters of remote

serial ports (baud rate, flow control, etc.), detect line signal changes, as well as receive and

transmit data. The configuration information provided in this section applies to Digi device

functioning as RFC 2217 servers. If using the RFC 2217 protocol, do not modify the port settings

from the defaults. If the port settings have been changed, restore the factory default settings (see

"Restore a device configuration to factory defaults" on page 246). No additional configuration is

required.

TCP and UDP network port numbering conventions

Digi devices use these conventions for TCP and UDP network port numbering.

The application or Digi device that initiates communication must use these network ports numbers.

If they cannot be configured to use these network port numbers, change the network port on the

Digi device.

For this connection type... Use this Port

Telnet to the serial port 2001 (TCP only)

Raw connection to the serial port 2101(TCP and UDP)

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Digi ConnectPort X4 User's Guide Page 143