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Supported Commands 

 
Command Summary 
# = numerical zone or amplifier channel value 
$$ = second numerical value (may be one or two digits) 

Function 

 

Command 

 

Range   

Read/Write 

Remarks 

 
Version  

 

(vr?) 

 

 

none 

 

read only 

Reset   

 

(rx) 

 

 

none 

 

write only 

1 second 

Channel On 

 

(#on) 

 

 

1-4  

 

write only 

Channel Off 

 

(#of) 

 

 

1-4  

 

write only 

 

 

Mute 

 

 

(#mu)   

 

1-4  

 

write only 

Un-mute 

 

(#um)   

 

1-4  

 

write only 

Mute All 

 

(amu)   

 

none 

 

write only 

Un-mute All 

 

(aum)   

 

none 

 

write only 

Volume Request 

(#vl?)   

 

1-4 

 

read only 

Volume Set 

 

(#vl$$)   

 

1-4 / 0-87 

write only 

Volume All 

 

(avl$$)   

 

0-87 

 

write only 

Input Request   

(#sl?)   

 

1-4 

 

read only 

Input Set 

 

(#sl$)   

 

1-4 / 1-4 

write only 

Input Select All   

(asl$)   

 

1-4 

 

write only 

All Channels On      

(aon)                              none                 write only 

All Channels Off 

(aof) 

 

 

none 

 

write only 

All Channels Vol up      (avlu)                            none                  write only 

Note 1 

All Channels Vol dn      (avld)                            none 

             write only 

Note 1 

Channel Vol up             (#vlu)                            1-4                     write only 

Note 1 

Channel Vol down        (#vld)                            1-4                     write only  

Note 1 

Bass adjustment 

(#b$) 

 

           1-4 / 0-F  

write only 

Note 2 

Treble adjustment 

(#t$) 

 

           1-4 / 0-F  

write only 

Note 2 

Display treble                (#b?)                             1-4   

             read  only   

Display bass                  (#t?)                           

1-4 

 

read  only   

 
Note1: Volume up or down requests increase or decrease volume level by 5 
Note 2: Treble and bass commands use hexadecimal values 0-F, default (flat) is 8. 
  
Also, it is best to leave about a ½ second between commands, as some integrators may miss 
commands if they are entered too quickly. 
 
All commands also send a message back to the terminal after they have been completed, so that 
it is easy to keep track of the previous commands that were sent.  
 
Note:   Some commands are read or write only and some are both 

– for example:  

Mute All is a write only command and Version is a read only command. 

 
Supported Command Messages 
Function 

 

Command 

 

Message 

 
Version  

 

(vr?) 

 

 

Version Number 

Reset   

 

(rx) 

 

 

“Resetting...” 

Channel On 

 

(#on) 

 

 

“Zone # on” 

Channel Off 

 

(#of) 

 

 

“Zone # off“ 

Mute 

 

 

(#mu)   

 

“Zone # muted” 

Un-mute 

 

(#um)   

 

“Zone # unmuted” 

Mute All 

 

(amu)   

 

"All channels muted" 

Un-mute All 

 

(aum)   

 

"All channels un-muted" 

Volume Request 

(#vl?)   

 

"Zone # volume level = $$" 

Summary of Contents for Eco-System GRS44

Page 1: ...GRS44 8 Channel Eco System Controller Amplifier Installation Instructions v1 0...

Page 2: ...Refer all servicing to qualified service personnel Servicing is required when the apparatus has been damaged in any way such as power supply cord or plug is damaged liquid has been spilled or objects...

Page 3: ...between the equipment and receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected Consult the dealer or an experienced radio TV technician fo...

Page 4: ...tion volume level bass and treble is made using RS232 commands Rooms can have different source selections volumes etc Four internal 80 position stereo volume controls GRS44 consists of a total of 8 po...

Page 5: ...stack other components on top of your amplifier Connecting your amplifier When making connections between any source components and the amplifier or when making connections to any speaker be certain t...

Page 6: ...m off All strands must be used for optimal performance Insert the wire into the plug and screw the screws very tight Inspect that no wire hairs that can short circuit are not in the plug Correct polar...

Page 7: ...cases a read request followed by a or a write request followed by 0 2 ASCII digits A read command will return the current setting and write command will change the setting Read request format nAA whe...

Page 8: ...ite only Note 1 Bass adjustment b 1 4 0 F write only Note 2 Treble adjustment t 1 4 0 F write only Note 2 Display treble b 1 4 read only Display bass t 1 4 read only Note1 Volume up or down requests i...

Page 9: ...ample of what the responses may look like Function Command Response Window On Off 1on Zone 1 on Select Input 1sl3 Zone 1 input 3 set Set Volume 1vl50 Zone 1 volume level 50 Set Bass 1baf Zone 1 Bass s...

Page 10: ...e or more channels Check input connections No audio from one or more Speakers are not connected properly Check speaker Channels connections at amp and speaker Audio levels differ from sources Improper...

Page 11: ...AND EXCLUSION Knoll shall have no further obligation under the foregoing limited warranty if the Product has been damaged due to abuse misuse neglect accident unusual physical or electrical stress un...

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