Rs-232 Feedback - Krell Industries EVOLUTION 707 Owner's Reference Manual

RS-232 Feedback

OVERVIEW
The Evolution 707 is equipped with a system that can report back its operational status via the RS-
232 port. The system reports it's operational status by transmitting a block of status data. The block
is confi gured as 18, 8 bit words. The fi rst and last word always contains hexadecimal code 55 to
facilitate message framing and synchronization. When the data block is sent through an RS-232 port,
each 8 bit word transmitted will also have 1 stop bit associated with it.
The feedback system is only available via the RS-232 port. The Status can be activated in 2 ways.
The fi rst way is to ask for status to be sent by sending the RS-232 command "STAZ". The second way
is to enable auto status by sending the RS-232 command "ASTEZ", Once this command is sent, the
Evolution 707 will transmit a status block whenever the status changes. Auto Status is disabled by
sending the RS-232 command "ASTDZ". Auto Status remains enabled until AC power is removed or
turned off.
All numeric values described in the following are decimal values unless otherwise noted. The description of the eighteen 8 bit words are as
follows:
WORD 1: Start of Message
Bit 7
0
Bit 7 – 0: Hexadecimal 55
WORD 2: General Status I
Bit 7
System
Mute
Bit 7: System Mute
Bit 6: Main Mute
Bit 5: Zone 2 Mute
Bit 4: Current Zone
Bit 3: Input Trigger
Bit 2: Zone 2 Only
Bit 1: Zone 2 Power
Bit 0: Main Power
6 5
1 0
6 5
Zone 2 Current
User Mute
Mute
1 = Internal mute is active
1 = Main mute is active
1 = Zone 2 mute is active
1 = Zone 2 is active
1 = 12V input trigger is active
1 = Only Zone 2 power is on
1 = Zone2 power is on
1 = Main power is on
4 3
1 0
4 3
Input Zone 2
Zone Trigger Only
2 1 0
1 0 1
2 1 0
Zone 2 Main
Power Power