Roland VR-50HD MK II Reference Manual page 59

Commands spontaneously sent from this unit
Item
Send status of the VIDEO INPUT SELECT
buttons
Error detected
Sent Response
Parameter
command command
stxPGM:a; stxQPG:a; a: 0 (INPUT 1), 1 (INPUT 2), 2 (INPUT 3), 3 (INPUT 4), 4 (STILL)
* This is enabled when the unit receives the command "stxCPG: 1;. "
stxTRS:a; stxERR:a; a: 0 (syntax error) The received command contains an error.
4 (invalid) This has no effect because it is controlled by another setting.
5 (out of range error) An argument of the received command is out of range.
LAN/RS-232C Command Reference
59