Copyright: Copyright © 1999-2001 Digi International, Inc. All Rights Reserved.
Citation: Copyright © 1999-2001 Digi International, Inc. All Rights Reserved.


IP Address and TCP Port

Use this page to define the IP address or DNS name, and the TCP port number for the terminal server you are installing.

IP Address

Enter the IP address assigned to this terminal server. Use decimal numbers in the IP address fields. Use the Tab key to move to the next field. If you use this field, the DNS Name field is disabled.

TCP Port

Enter the TCP port number assigned to this terminal server.

The wizard will attempt to connect to a terminal server at the IP address and TCP port number that you supply. If it cannot connect, you will see several error messages, but you will be able to proceed with the RealPort driver configuration. Before you can use the RealPort driver, however, you must determine the reason the wizard could not connect:

•	You should verify that you are using the IP address and TCP Port number configured in the specific terminal server.

•	You should check the Event Log to see if an error is recorded.

DNS Name

For PortServer III terminal servers, you can enter a valid DNS name instead of an IP address. If you use this field, the IP Address field is disabled.

DgIPServ

Start the DgIPServ utility if you need to assign an IP address to an EtherLite network serial concentrator. This button is enabled for EtherLite devices only.


About the PortServer IP Address
About the Terminal Server IP Address

The IP address must be specific to your network and is therefore usually determined by your network administrator.

During initial hardware setup, the unique IP address must be configured in the terminal server itself. See the hardware installation guide for procedures specific to your terminal server.

You must use this unique IP address to specify the terminal server in your RealPort configuration. You cannot use RealPort to change the IP address configured in a terminal server.


About the PortServer TCP Port number
About the Terminal Server TCP Port number

For all Digi terminal servers, the factory preset TCP port number is 771. See your terminal server documentation for the specific procedure to view or change the TCP port number.

For EtherLite terminal servers, the TCP port number cannot be changed.


Name and Number of Ports

Use this page to define the terminal server name and the number of ports to configure for the terminal server you are installing.

Name

Enter a name for this terminal server.

If you do not type a name, the wizard supplies a default name. You can later change the name by accessing the Properties window.

Number of Ports

Enter the number of ports you will use.

The actual number of ports found on your terminal server is displayed by default. You can change this value to a number less than the actual number of ports if you do not plan to access all of the available ports using the RealPort service. You can later add or remove ports by accessing the Properties window.

Note: You can also install more ports than actually exist on your terminal server, but you will not be able to use them.


What To Do Next?

At this point your configuration is complete. You can continue with any of the following tasks:

•	Choose Finish to see the Digi RealPort Service Setup window.

•	To change the default names of the terminal server ports, choose the check box, and then choose Finish.

•	If you want to make changes to the terminal server name, the number of ports, the IP Address, or the Port number, choose Back until you get to the appropriate screen, or choose Finish and access this information through the EtherLite/PortServer Properties window.


Digi RealPort Service Setup

Use this page to change your RealPort configuration. This page displays a tree view of the terminal servers configured for your system and all of the ports configured on each terminal server. By default, RealPort assigns the next available COM numbers to terminal server ports you define on your system.

Use the following buttons to change the configuration:

Add

•	Adds a terminal server if you choose your system’s name from the list. The Add button displays the first window in the configuration process.

•	Adds a port to a terminal server you choose from the list. The Add button displays the Add Port page, showing properties for the next available port. You can change these port properties to any valid values not already assigned to a port on your system.

Remove

•	Removes a terminal server you choose from the list.

•	Removes a port you choose from the list.

Note: If a device is in use on a terminal server port you remove, all processes associated with the device are disconnected without warning.

Properties

•	Displays the Windows NT Diagnostics page if you choose your system’s name from the list.

•	Displays the Properties page if you choose a terminal server from the list.

•	Displays the Port Properties page if you choose a port from the list.


Ports Tab

Use this page to view or change port properties. This page displays a tree view of the ports configured on this terminal server.

Use the following buttons to view or change ports:

Add

Adds a port to this terminal server. The Add button displays the Add Port page, showing default properties for the next available port. You can change these port properties to any valid values not already assigned to a port on your system.

Properties

Displays the Port Properties page, showing current properties of a port you choose from the list.

Remove

Removes a port you choose from the list.

Note: If a device attached to the port you remove is in use, all processes associated with the device are disconnected without warning.


Add Port

This page displays default port properties for the next available unassigned port on your system.

You can change the following properties:

Port

Shows the next available unassigned terminal server port number. You can change this value to any valid port number not already in use.

Name

Shows the next available default port name. To change the name, enter a new unique name in the Name field. For example, if a printer is attached to port 5, you may wish to change the port name to Printer.

This port will be used for printing.

If you attach a printer to this port, choose this check box to enable RealPort printer support.

More about ports


Port Properties

Use this page to view or change the properties of a port you chose from the list. You can view or change the following properties:

Port

Shows the current terminal server port number. To add a new port to this terminal server, enter a port number not already in use, and then enter a unique name in the Name field.

Name

Shows the current port name. To change the name of the current port, enter a new unique name in the Name field. For example, if a printer is attached to port 5, you may wish to change the port name to Printer.

This port will be used for printing.

If you attach a printer to this port, choose this check box to enable RealPort printer support.

More About Ports


More About Ports

•	Ports on the terminal server are physically labeled with the number of the port, starting with 1. A terminal server can have up to 64 ports available if you add expansion modules to the base terminal server. Each of the terminal server ports is assigned a default system name during RealPort installation: COM2, COM3, COM4, etc.

•	Ports do not need to be added or maintained in sequence. You can change the Port field to any valid port number. For example, you may use ports 1 through 8 for modems and port 26 for a printer. If those are the only ports you use, you can shorten your list by deleting unused ports.

Note: You can also install more ports than actually exist on your terminal server, but you will not be able to use them.


Digi International Tab

Use this page to change the configuration properties of this terminal server. You can change the following properties:

•	Name

•	IP Address

•	TCP Port

•	Poll Cycle

•	Max Packet Size

Note: The IP Address and TCP Port values must match the values configured in this specific terminal server.

Name

Displays the current name given to the terminal server at this IP address. You can change the name at any time by supplying a new name in this field.

This name has no significance to your network configuration; it is simply a convenient way to label the device. You should use a name that uniquely identifies the terminal server (for example, by its location or function).

IP Address

Displays the IP address configured in RealPort for this terminal server. This value must match the IP address configured in the terminal server itself. See your terminal server documentation for procedures to view or set the value.

TCP Port

Displays the RealPort TCP port number configured for this terminal server. The default TCP port number is 771.

If you are having trouble connecting to the terminal server using the default of 771, check the actual TCP Port set in the terminal server. See your terminal server documentation for procedures to view or set the value.

For EtherLite terminal servers, the TCP port number is set to 771 and cannot be changed, so your system may have another problem.

Poll Cycle

The Poll Cycle is the number of milliseconds the RealPort driver waits for additional data to make a full packet (as defined by Max Packet Size) before sending the packet to the terminal server. If the Poll Cycle time elapses and the packet is not full, the packet is sent anyway.

Depending on your system setup, you may wish to increase the default value to cause less traffic on the network.

The valid Poll Cycle range is 10 to 1000 milliseconds.

Max Packet Size

The default Max Packet Size value (1460) optimizes the RealPort driver for TCP/IP over Ethernet. You should change the default only if you are using media other than Ethernet.

Max Packet Size is the number of bytes of data that the RealPort driver will put into a packet. To keep overhead to a minimum, this value must be the same as or smaller than the data portion of the MTU (Maximum Transmission Unit) of the network medium that carries the packet to the terminal server.

If the Max Packet Size is greater than the data portion of the MTU, all of the data in a RealPort packet will not fit in a single media packet, leftover data must be sent in a second packet, and traffic over the network will increase.

Example MTU packet structure for Ethernet:

Field	Size in Bytes
MAC	14
IP(V4)	20
TCP	20
TCP Data	1460
FCS	4

Total MTU size = 1518 bytes

Allowable Max Packet Size range is from 3 to 65,535 bytes.


Ethernet Address

Each device with Ethernet connectivity has a unique Ethernet medium access control (MAC) address. The twelve-digit hexadecimal MAC address assigned to your EtherLite is located on a label on the bottom of the device.

Enter the MAC address in the Ethernet Address fields. The first six digits are fixed values; you need to supply only the last six digits.

Example of a MAC Address:

00 A0 E7 21 CB 90


Operation Selection

Choose an operation to perform on the EtherLite you specified in the Ethernet Address window. Each of the following choices opens a specific window to complete the operation:

•	Store IP

Choose Store IP to assign an IP address to an EtherLite for the first time. Because the IP address must be unique within your network, you should request a valid IP address from your network administrator.

•	Erase IP

Choose Erase IP to erase an EtherLite IP address without assigning a new one.

•	Change IP

Choose Change IP to simultaneously erase an EtherLite IP address and assign a new one.

•	Update Firmware

Choose Update Firmware to apply an update you downloaded from the Digi Support Web site (http://support.digi.com).


Assign IP Address

Enter the IP address you wish to assign to the EtherLite. Use decimal values for each field, with no leading zeros.


Erase IP Address

If you know the IP address currently assigned to the EtherLite, enter it here using decimal values for each field, with no leading zeros. Otherwise, choose IP Address Unknown.


Output

This window displays any instructions you must follow to complete the operation you chose. It also displays current status of the operation.