User's Manual
VP-81K - Kramer Protocol  33 
Operation Commands 
Command  Syntax Response 
Lock front panel 
LOCK-FP LOCK-MODE 
Short form: LCK LOCK-MODE 
LOCK-FP LOCK-MODE RESULT 
Get front panel locking state 
LOCK-FP?
LOCK-FP LOCK-MODE 
Parameters Description: 
LOCK-MODE  = Front panel locking state: 
 "0" or "off" to unlock front panel buttons. 
 "1" or "on" to lock front panel buttons. 
Restart device  RESET RESET OK 
Switch to protocol 2000*  P2000 P2000 OK 
* Protocol 2000 has command to switch back to ASCII protocol (like protocol 3000) 
Audio Parameter Commands 
Command Syntax Response 
Set audio level in specific 
amplifier stage. 
AUD-LVL STAGE, CHANNEL, VOLUME 
Short form: ADL STAGE, CHANNEL, 
VOLUME 
AUD-LVL STAGE, CHANNEL, 
VOLUME RESULT 
Read audio volume level 
AUD-LVL? STAGE, CHANNEL 
Short form: ADL? STAGE 
AUD-LVL STAGE, CHANNEL, 
VOLUME 
Mute audio 
MUTE MUTE-MODE 
MUTE MUTE-MODE RESULT 
Parameter Description: 
STAGE  =  
"In","Out" 
or 
Numeric value (present audio processing stage). For example: "1" for Input level, "2" for Amplifier (Out) etc. 
CHANNEL  = Input or Output # 
VOLUME  = Audio parameter in Kramer units, precede minus sign for negative values. 
   ++ increase current value 
-- decrease current value 
MUTE MODE = 1 – Mute 
 0 – Unmute 
Machine Info Commands 
Command Syntax  Response 
* Time setting commands require admin authorization 
Read in/out count 
INFO-IO? 
INFO-IO: IN INPUTS_COUNT, OUT OUTPUTS_COUNT 
Read max preset count 
INFO-PRST? 
INFO-PRST: VID PRESET_VIDEO_COUNT, AUD 
PRESET_AUDIO_COUNT 
Reset configuration to 
factory default 
FACTORY 
FACTORY RESULT 
Identification Commands 
Command Syntax  Response 
Protocol Handshaking  #CR  ~OK CRLF 
Read device model 
MODEL? 
MODEL MACHINE_MODEL 










