Customizing Terminal and Printer Type Files with the Workstation Configurator (32022-90031)

16 Chapter 1
Introducing Workstation Configurator
What Characteristics are Modifiable?
Read Trigger
The read trigger character is used to tell the terminal when to send
characters to the driver. This character is normally the DC1 character.
Using Workstation Configurator, any character can be specified as the
read trigger character. If the device requires a multiple character
sequence for a read trigger, the first number minus one (n-1)
characters can be sent to the device through a write and the last
character can be made the read trigger character.
Special Characters
There are several characters that have special significance to the driver.
These characters cause the driver to take special actions.
With Workstation Configurator, defining characters to cause a special
action is possible. The characters that have special significance to the
driver are as follows:
• Backspace.
• Cancel line.
• End-of-Record.
• Subsystem break.
Each of these are described in the pages that follow.
Backspace
This special function is entered by pressing [Backspace]. If enabled,
backspace causes the cursor to back up one space, but it does not erase
the character.
Cancel Line
This special function is entered by pressing [CTRL]-[X]. Cancel deletes
the current line. The system verifies the cancellation by printing three
exclamation marks (!!!), followed by a carriage return and a line feed.
End-of-Record
This function takes place during a read. When a read is issued, it has
an expected length associated with it. By entering an end-of-record
(EOR) character, the read can be terminated before the full number of
characters has been entered. With Workstation Configurator, two types
of EOR characters can be specified.
With the first type, the EOR character terminates the read, but it is not
included in the data returned to the program doing the read or the
actual count of characters. The read is returned with good (CCE) status.