HPlogo Customizing Terminal and Printer Type Files with Workstation Configurator: HP 3000 MPE/iX Computer Systems > Chapter 4 Workstation Configurator — Screen and Field Definition

Flow Control

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The Flow Control screen is the third Workstation Configurator screen. To select this screen, enter F in the Go to form field on the Main Menu screen and press the [Enter] key or press the NEXT FORM [F6] function key on the Convert MPE/V Termtype screen. The menu shown in Figure 4-3 “Special Characters Screen” is then displayed.

Figure 4-3 Special Characters Screen

[Special Characters Screen]

Fields

The Flow Control screen lets you configure the following functionality:

  • Driver uses an XON/XOFF protocol (Y/N). This field lets you turn on or off the XON/XOFF protocol. If XON/XOFF is enabled, you can specify whether a timer is started when the XOFF is received. You can also specify the length of the timer period, in seconds. Valid timer periods range from 1 to 255 seconds.

  • Typeahead buffer behavior for sending second XOFF. The HP 3000 sends an XOFF to the terminal when its typeahead buffer is full. The value entered in this field specifies how often the HP 3000 will send an XOFF, after its typeahead buffer is full.

    • 0delayed. If 0 is entered, the HP 3000 will wait to send an XOFF until 16 characters are received after the typeahead buffer is full. HP recommends delaying the sending of an XOFF if data switches are used in the computer network.

    • 1immediate. If 1 is entered, the HP 3000 will send an XOFF after each character is received when the typeahead buffer is full.

  • Block mode support. This field lets you configure the type of block mode your terminal will use. The types of block mode are none, line, page, or both. If block mode is used, the values for the block mode trigger and alert characters are displayed.

  • Read trigger character. This field lets you configure the read trigger character. This character lets the terminal know that the HP 3000 system is ready to receive data. If the field is left empty, then no trigger character is written by the driver at the beginning of a read.

NOTE: The block mode read trigger character and the read trigger character should be the same. For example, if the block mode read trigger character is DC1, then the read trigger character should be DC1.