Step 3: Configuring Flow Control

Figure 2-2 Flow Control Screen

1. Verify that the cursor is in the Driver uses an XON/XOFF protocol (Y,N) field. Terminals and printers use the XON/XOFF protocol to tell the HP 3000 that they cannot accept any more data and when they are ready to accept data again. Type Y.

2. Press the [Tab] key to move the cursor to the Timer enabled? (Y,N) field.

3. Verify that the cursor is in the Timer enabled (Y,N) field. If the timer is enabled and it expires before an XON is received from the terminal or printer, a message saying the device is offline is printed on the system console.

4. Type Y.

5. Verify that the cursor is in the Timer period (seconds) field.

6. Type the number of seconds, from 1 to 255, that the timer will be enabled for. This is the amount of time the HP 3000 will wait for the XON from the terminal or printer.

1. Verify that the cursor is in the Does driver use an XON/XOFF protocol (Y,N) field. Type N.

1. Verify that the cursor is in the Typeahead buffer behavior for sending second XOFF field. 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.

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

3. Type 1 to specify that an XOFF should be sent to the terminal after each character is received when the terminal buffer is full.

1. Press the [Tab] key to move the cursor to the Block mode support (N, L, P, B) field. Type the first letter of the block mode that this terminal type file will use. The types of block mode are none, line, page, or both.

2. Verify that the cursor is in the Characters: alert field. This is the character that the terminal uses to alert the system that a block of data is coming.

3. Type the alert character for this terminal type file. In most instances, this character is the DC2.

4. Verify that the cursor is in the Characters: trigger field. This is the character that the system uses to tell the terminal that it is ready to receive the data.

5. Type the trigger character for this terminal type file. In most instances, this character is the DC1.

1. Press the [Tab] key to move the cursor to the Read trigger character field. This character tells the terminal that the HP 3000 is ready to receive data.

2. Type the read trigger character for this terminal type file. The read trigger character entered here must be the same read trigger character entered for block mode. In most instances, this character is the DC1.