ASTRO VG-871 - Basic Formats; When Setting Commands Are Sent; When the Get Command Is Sent

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1.9 Basic formats
1.9.1 When setting commands are sent
Command transmission from computer to VG generator (PC → VG)
STX
VG4CMD
Command 1
Command 2
ETX
or
STX
VG4CMD
Command 1
Command 2
Parameters
ETX
Return value from VG generator to computer after command transmission (PC ← VG)
ACK
or
STX
ESTS
Error code
ETX
When data is required, transmission is as shown below only when the commands were
sent and ACK was returned. (PC → VG)
STX
TRDT
Data
ETB
or
STX
TRDT
Data
ETX
Return value from VG generator to computer after data transmission (PC ← VG)
ACK
or
STX
ESTS
Error code
ETX
Fig. 1-9-1
1.9.2 When the get command is sent
Command transmission from computer to VG generator (PC → VG)
STX
VG4CMD
Command 1
Command 2
ETX
or
STX
VG4CMD
Command 1
Command 2
Parameters
ETX
Return value from VG generator to computer after command transmission (PC ← VG)
ACK
or
STX
ESTS
Error code
ETX
Reception is as shown below only when ACK is returned. (PC ← VG)
STX
TRDT
Data
ETB
or
STX
TRDT
Data
ETX
Fig. 1-9-2