user manual
Kramer Protocol 
33
Note: Before sending any of the codes in Table 13, the command 2A 86 80 81 
must be sent. 
Table 13: Hex Codes that Set the Audio Input Gain  
IN 1  IN 2  IN 3  IN 4  IN 5  IN 6  IN 7  IN 8 
Level 
[Rel] 
16 81 80* 81  16 82 80* 81  16 83 80* 81  16 84 80* 81  16 85 80* 81  16 86 80* 81  16 87 80* 81  16 88 80* 81 
-63dB 
Mute 
… 
… 
… 
… 
… 
… 
… 
… 
16 81 8D
*
 81  16 82 8D
*
 81  16 83 8D
*
 81  16 84 8D
*
 81  16 85 8D
*
 81  16 86 8D
*
 81  16 87 8D
*
 81  16 88 8D
*
 81 
-50dB  
… 
… 
… 
… 
… 
… 
… 
… 
16 81 BF
*
 81  16 82 BF
*
 81  16 83 BF
*
 81  16 84 BF
*
 81  16 85 BF
*
 81  16 86 BF
*
 81  16 87 BF
*
 81  16 88 BF
*
 81 
0dB 
… 
… 
… 
… 
… 
… 
… 
… 
16 81 C6
*
 81  16 82 C6
*
 81  16 83 C6
*
 81  16 84 C6
*
 81  16 85 C6
*
 81  16 86 C6
*
 81  16 87 C6
*
 81  16 88 C6
*
 81 
+7dB 
(Max) 
* BYTE 3 = 0x80 + Gain Value (0x00-0x46) 
UTable 14U lists the Hex codes that increase or decrease the audio output gain.  
Table 14: VP-8x8AK Hex Codes for Increasing/Decreasing the Output Gain 
OUT 1 
OUT 2 
OUT 3 
OUT 4 
OUT 5 
OUT 6 
OUT 7 
OUT 8 
Increase  18 81 80 81  18 82 80 81  18 83 80 81  18 84 80 81  18 85 80 81  18 86 80 81  18 87 80 81  18 88 80 81 
Decrease  18 81 81 81  18 82 81 81  18 83 81 81  18 84 81 81  18 85 81 81  18 86 81 81  18 87 81 81  18 88 81 81 
UTable 15U lists the Hex codes that set the audio output gain.  
Before sending the any of the codes in 
UTable 15U, the command 2A 87 80 81 must 
be sent. 
Table 15: Hex Codes for Setting the Audio Output Gain 
OUT 1 
Level 
[Rel] 
16 81 80* 81 
-30dB  
…
16 81 9E
*
 81 
0dB 
…
16 81 B2
*
 81 
+20dB  
*BYTE 3 = 0x80 + Gain Value (0x00-0x32) 
17  Kramer Protocol 
USection  17.1U describes how to switch between Protocol 3000 and Protocol29F
1
 2000. 
By default, the VP-81KSi is set to protocol 3000 (see 
USection  17.2U) but is also 
compatible with Kramer’s Protocol 2000 (see 
USection  17.3U).  
1 You can download our user-friendly “Software for Calculating Hex Codes for Protocol 2000” from the technical support section at 
http://www.kramerelectronics.com










