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Intermediate parameters are data which specify certain values and are used
between the ESC control character and the final parameter and have the
following format.
Bit 7: Always 0
6: Always 1
5:
J
4:
These five bits are used
3:
to represent a parameter.
2:
1 :
A final parameter has the following format:
Bit 7: Always 1
6: Always 0
5:
4:
J
These five bits are used
3:
to represent a parameter.
2:
1 :
Parameters can be truncated in the middle of a parameter sequence by
specifying a final parameter value.
If a wrong escape sequence format is specified, the display station will detect
that command and will not process it. The following formatting errors can be
detected:
•
An unauthorized final or intermediate character (undefined command).
•
An undefined parameter or an incorrect length (invalid parameter).
•
An undefined command in a specific mode (inapplicable command).
When the display station receives an undefined command or detects an invalid
parameter, it displays HOST PROG WRONG. If the Read Status command is
specified in the host application, this command error is reported back to the
host system.
5-15
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