ASTRO VG-877 - Type 7; Precaution Drawing Command

Chapter 1 CONCERNING THE TERMINAL COMMANDS
15
1.10.7 Type 7
This is the sequence for receiving the VG data. Unlike with type 3, “TRDT” is not
received.
Fig. 1-10-7-1
Flow
Command
Send/receive direction
1
STX
Command*1
(Parameters)
ETX
Send
2a (Successful)
ACK
Receive
2b (Failed)
STX
ESTS
Error code
ETX
Receive
3
STX
Data
ETX
Receive
Fig. 1-10-7-2
Note1) It is assumed here that the following three codes are entered in the command portion.
VG4CMD
Command 1
Command2
Note2) The flow is terminated at 2b if communication failed.
1.11 Precaution drawing command
Drawing command for graphic plane (in previous terminal command, it was referred as
color plane) please remind about following issues.
1. Pattern cannot be displayed with other pattern
If you execute the graphic plane drawing command when you are displaying pattern by
VG’s front panel or remote controller, for example color bar, pattern will be abnormal.
2. Before executing the graphic plane drawing command, please execute the clear
command (GRACLR4 {28H 40H}: Graphic plain clear).
3. Color table for graphic plain drawing command, will be 0 to 255.