
Appendix A • 
Command/Response Table
Definitions and abbreviations:
= CR/LF
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 = input #1 through 6, or 0 = input disconnected ![]()
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 = 0 thru 255 (enhancement control range)
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 = xxx.xx (frequency in Hz or kHz)
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 = 0 thru 9 (10 steps of audio gain)
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 = numeric value 
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 = controller software version to 2nd decimal place
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 = 0 or 1, 0 = Off, 1 = On
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 = 15 thru 1 (15 steps of audio attenuation)
· = space (If indicated, the space must be there.) Ah = this is a hexadecimal number
ph = phase: Hph - horiz shift; Vph - vert shift
rt = rate: Hrt - horiz frequency rate; Vrt - vert frequency rate
mt = mute: Amt - audio mute brt= brightness - video level
Command from Host | 
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  | Host Code | Resp | Examples | 
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Description  | 
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  | ASCII HEX | to Host  | Com.  | Response  | Action/Explanation  | |||||||||||||||||||||||
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Select input channel (aud & vid)  | !  | 
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  | h21h  | C  | 5!  | C5  | Select input channel #5(aud & vid)  | |||||||||||||||||||||
Select input channel (audio only)  | $  | 
  | h24h  | A  | 3$  | A3  | Select audio input channel #3  | |||||||||||||||||||||||
Select input channel (video only)  | &  | 
  | h26h  | V ø  | 4&  | V4ø  | Select video input channel #4  | |||||||||||||||||||||||
Set hor. shift value (Hph)  | 
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  | 39H  | Hph039  | Set horizontal shift value to 39  | |||||||||||||||||||||
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Increment horizontal shift value  | 
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  | {H 7Bh48h  | 
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  | {H  | Hph040  | Increase horizontal shift by 1  | ||||||||||||
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Decrement horizontal shift value  | 
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  | }H  | 7Dh48h  | 
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  | }H  | Hph039  | Decrease horizontal shift by 1  | |||||||||||
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  | 57/  | Vph057  | Set vertical shift value to 57  | ||||||
Set vert. shift value (Vph) to  | 
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Increment vertical shift value  | {/  | 
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  | 7Bh2Fh  | 
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  | {/  | Vph058  | Increase vertical shift value by 1  | ||||||||||||||
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Decrement vertical shift value  | }/  | 
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  | 7Dh2Fh  | Vph  | ø  | }/  | Vph057ø  | Decrease vertical shift value by 1  | |||||||||||||||||||||
Note: A higher value moves the image downward, and a lower value moves it upward on the screen.  | ||||||||||||||||||||||||||||||
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Set video level value (Brt)  | 
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  | 32Y  | Brt032  | Set video level value to 32  | ||||||||||||
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Increment video level value  | 
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  | {Y  | Brt033  | Increase video level by 1  | |||||||||||||||||||
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Decrement video level value  | 
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  | }Y  | 7Dh59h  | Brt  | 
  | }Y  | Brt032ø  | Decrease video level by 1  | |||||||||||||||||||||
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Audio   | 
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  | 7A  | Amt0  | z  | Amt0  | Mute is off.  | |||||||||||||||||||||
Audio mute  | 
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  | 5A  | Amt1ø  | Z  | Amt1ø  | Mute is on.  | |||||||||||||||||||||
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Set channel gain (Aud) to  | 
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  | G  | 47  | 
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Set audio channel attenuation  | 
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  | g  | h67h  | Aud  | 
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Increment audio level value  | 
  | {G  | 7Bh47h  | Aud  | 
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Decrement audio level value  | 
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ø
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7G  | Aud+07  | Set audio value to +7 dB  | 
1g  | Set audio value to   | |
{G  | Aud+08  | Increase audio level by 1  | 
}G  | Aud+06ø  | Decrease audio level by 1  | 
Information request (Same as I)  | i  | 69h  | V ·A  | ·Amt  | 
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·Hph  | ·Vph ·Brt  | ·Aud ·Hrt ·Vrt ·Max6  | ||||||||||||
Information request  | I  | 49h  | 
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  | ·Aud ·Hrt ·Vrt ·Max6ø  | |||
V ·A ·Amt ·Hph  | ·Vph  | ·Brt  | ||||||||||||
Where: V=video channel; A=audio channel; Amt=aud mute; Hph = horiz shift; Vph=vert shift; Max=highest channel#  | ||||||||||||||
Response example: V2·A2·Amt0·Hph000·Vph255·Brt127·Aud+03·Hrt015.75·Vrt059.93·Max6  | ||||||||||||||
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Request part number (Same as N)  | n  | 6Eh  | 
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Request part number  | N  | 4Eh  | 
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Query software version (Same as Q)  | q  | 71h  | QVER  | 
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  | QVER1.23  | (1.23 is example only)  | ||||||
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Query software version  | Q  | 51h  | QVER  | 
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Error Response | Code | 
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Invalid channel number  | E01  | 
  | Input number requested could be greater than 6 (too large).  | |||||||||||
Invalid command  | E10  | 
  | Command code not recognized.  | 
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Invalid value  | E13  | 
  | Specified number could be out of range. (e.g., set video level to 256)  | |||||||||||
Busy  | E16  | 
  | Adjustments are being made from an RGB 322/324/340 buffer.  | |||||||||||
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Extron • User’s Manual • RGB 320 Switchingø  | Interface System  | 
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