Analog Way Smart Vu - SVU300 Programmer's Guide - Manual (Page 3)

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A [write command] is made of indexes followed by the numerical value followed by the command characters.
Write command = [[index,] ...] + Value + Character (s) code (s)
For example: “1,2,0IN” or “4YB”
A [read command] is made of indexes followed immediately by the command characters. (no numerical value)
Read command = [[index,] ...] Character (s) code (s)
For example: “1,2,IN” or “YB”
A3: Examples
Document notation:
1) Command with 1 index : OFORMAT
Command to set the Main output format to XGA: 0,12OF
Answer: OF0,12<CR><LF> which mean that the main output format is now 1024x768
2) Command with 2 indexes : PE_INPUTNUM
Command to set the input 4 displayed in background layer of Next Preset: 1,2,4IN
Answer: IN1,1,4<CR><LF> which mean that the background layer of the next preset will display the input 4 signal
3) Read command without index : TAKEAVA
Read command to know if the TAKE command is available: TA
Answer: TA1<CR><LF> which mean that the device is ready to accept the TAKE command.
4) Read command with 2 indexes : SET_ASPECT_RATIO_OUT
Read command to know how is displayed a signal plugged on the input 4: 3,so
Answer: so3,2<CR><LF> which mean that the input 4 is displayed cropped