Modem Row Edit: Communications tab

Terminal Server/ Host Name

Enter the IP addresses of the host terminal server or host computer. These must be defined in the terminal server table, or as an entry in the hosts file of the RealTime computers. Either an IPv4 or an IPv6 address can be used.

Port Number

Enter the specific port connection for the line at the terminal server or remote. This port definition varies depending on the brand of the terminal server. For example:

Port Number = 2000 + (100*port)

Therefore, port 4 on the terminal server has a Port Number of 2400.

Default Signal Configuration

Select (...) and select the name of the default signal configuration the modem uses from the Sigconfig Select dialog box. This indicates the maximum baud rate that the modem can use.

Note: The Default Signal Configuration entry must match the default signal configuration of any connections using this modem.

Modem Baud Map

Enter the modem baud map.

Escape Sequence Pre/Post Pause (ms)

Enter the length of the pause (in milliseconds) before an escape sequence is sent.

After the escape sequence is sent, the time specified in this field is the delay time before a connect, disconnect or check sequence is initiated. A time of 1500 milliseconds is suggested.

Modem Escape Character

Enter the character that is sent three times to create the escape sequence and put the modem into command mode.

The + character is typically used.

Message Response padding

Enter the number of additional bytes that the modem sends back with responses.

For example, if the expected response is OK, but the modem actually sends back <CR> <LF> OK <CR> <LF>, the additional padding value is 4.

The message response padding can be determined by running SWANA in "Append ASCII" mode on a dial connection.

Maximum number of Failures

Enter the maximum number of failed dial attempts before the system generates a failure alarm or failure event.

To reach this value of failed attempts, typical modem responses must be received. If upon attempting to dial a remote modem, no responses are received to the "AT commands" (or whatever has been configured for your modem), an alarm is generated after one failure regardless of the value in this field.

Modem Type

Select the type of modem. Options:

• Hayes

• UDS 202

  By default, AVEVA Enterprise SCADA processes modem responses using the Hayes command set. Selecting UDS 202 makes AVEVA Enterprise SCADA process responses using the Universal Data Systems (UDS) 202 command set.