ASTRO VG-870, Instruction Manual

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1.5 Description of terms used
Term Description
Auto display data The length of the interval (in seconds) after the patterns have been output
until the next program is run as well as the sequence of the numbers of the
programs to be run when the VG generator is operated in the auto display
mode are set as parameters.
The sequence of program numbers can be set in a 3-block format. If, for
instance, program numbers 01, 02 and 03 are to be output first followed by
program numbers 07, 08 and 09 after which the programs are to be
repeated from 01, then 01-03 is set in the first block, 07-09 is set in the
second block, and 00-00 is set in the third block.
Pattern select data This data is for selecting which pattern is to be output if programs are run
when the VG generator is operated in the direct display or auto display
mode.
Bear in mind that “R, “, “G” and “B” must be entered in the data:
otherwise, the data will be registered without color.
Buffer RAM The VG generator calls one of the programs registered on the Compact
Flash card (or internal flash memory) to its execution RAM first, and it then
executes the contents of the program. This RAM is called the buffer RAM.
1-program data This is the increment of the data which is registered on the Compact Flash
card (or internal flash memory). The 1-program data consists of the H
timing data, V timing data, output condition data, pattern select data and
various pattern data.
User character This refers to the characters which can be created and registered by the
user. The size of these characters is 64 by 64 dots.
Character plane This is the plane on which 1-bit drawing with a single color is accomplished.
*
It was referred to as the “graphic plane” in the previous terminal
commands.
Graphic plane This is the plane on which drawings with 256 colors are displayed.
*
It was referred to as the “color plane” in the previous terminal
commands.
Fig. 1-5
1.6 Transmission control characters, data and error
commands
Character HEX code Description
ENQ 05H Request to start terminal mode
EOT 04H Request to end terminal mode
ACK 06H Positive acknowledge character
NAK 15H Negative acknowledge character
STX 02H Transmission text (command) start
ETB 17H Transmission text (data) end
ETX 03H Transmission text (command, data) end
TRDT 10H When data is to be transmitted, this command is placed at the head of
the block before it is transmitted.
ESTS 11H When an error status is to be transmitted, an error number is
transmitted with this command preceding it.
EXTCMD FFH Extended command identification code (* Added with old VG models)
VG4CMD FDH New command identification code
Fig. 1-6