InfoConnect Desktop Help & How To > Creating Terminal Sessions > VT Sessions > Configure Connection Settings Dialog Box (VT) > More Settings Modem Dialog Box

More Settings Modem Dialog Box

The settings in this dialog box control the modem currently selected in the Modem to use list. If you switch to another modem, these settings will then apply to that modem.

 

Connection mode

Select an action to take when making a modem connection.

 

 

Select

To do this

 

 

CALL

Dial the remote host specified in the Phone number box.

 

 

AUTO-ANSWER

Connect to the modem and wait for the first ring of an incoming call before answering.

 

 

ANSWER

Connect to the modem and immediately answer any incoming call.

 

 

DIRECT

Connect to the modem so you can enter modem commands in the terminal window.

 

 

DIALBACK

Dial the remote host specified in the Phone number box, disconnect, then wait for a return call. Use this setting if you are using a security dialback host.

 

Baud rate

Set the rate at which InfoConnect transmits and receives data through the selected modem.

The default baud rate is that specified in Windows Control Panel, from the Modem Properties dialog box, defined when you installed your modem.

When connecting to a host via modem, you may need to select a different baud rate. The maximum baud rate is a function of many factors, such as the type of modem you have and the quality and length of the communications line.

 

Parity

Set the parity for data transmission through this connection.

This setting determines whether a parity bit is generated for each character transmitted. Parity is used to detect errors in data transmission; the number preceding the slash indicates the number of data bits sent.

To use the multinational character set or 8-bit controls, Parity must be set to one of the values that offers 8-bit controls. If your communications link generates parity, and you set Parity to 8/None, multinational characters appear on your screen. In this case, set Parity to either 8/Even or 8/Odd.

 

Pacing

 

 

It is possible for InfoConnect to transmit data to a serial device faster than the device can process it, or for a serial device to transmit data to InfoConnect faster than InfoConnect can process it.

Should this continue for too long, the slower system's buffer overflows and data is lost. If the serial device recognizes the XON/XOFF handshake, you can prevent the buffer from overflowing by keeping this value set to Xon/Xoff.

Xon/Xoff transmit pacing works as follows:

  • When the receive buffer has a limited amount of space left, an XOFF (DC3) character is sent as a signal to stop transmitting.

  • After processing most of the backlog of characters in the receive buffer, an XON (DC1) character is sent as a signal to resume transmission.

The two systems continue in this stop-and-go fashion until all the data has been transmitted.

 

Transmit

Select a flow control method to use when InfoConnect transmits data to a serial device on this port.

 

Receive

Select a flow control method to use when the serial device on this port transmits data to InfoConnect.

 

Char transmit delay

It is possible for InfoConnect to send data to the host faster than the host can receive it. For example, if you paste text from the Clipboard into a host editor such as EDT, you may overrun the host's buffer.

By setting a delay between characters, you can specify how long InfoConnect should wait after each character when transmitting blocks of characters to the host.

This delay also affects character transmission during file transfers. Setting a value of 3 at 9600 baud lowers the effective speed of data transmission to about 2400 bits per second.

On a VMS host, setting the terminal's HOSTSYNC characteristic can also help prevent overrunning the host's buffer when pasting data. To do this, enter the following command at the DCL prompt: SET TERMINAL/HOSTSYNC.

For backward compatibility, you can enter a value for character delay of up to 255. However, the maximum in InfoConnect always reverts to 100.

 

Line transmit delay

Set the amount of time InfoConnect should wait after transmitting a carriage return character (the line delimiter) before transmitting the next line.

This setting also affects the delay between frames during file transfer using the WRQ/Reflection protocol. Assigning a delay may help if you are experiencing file transfer problems over an X.25 connection.

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