Word 1: start of message, Word 2: general status i – Krell Industries RS-232 User Manual
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RS-232 Status Feedback Description
for the Home Theater Standard 7.1
RS-232 Status Block Descriptions
for the Home Theater Standard 7.1
The Home Theater Standard 7.1 reports its operational status by trans-
mitting a block of status data via the RS-232 connector. The block is
configured as eighteen 8-bit words. The first and last word always con-
tains hexadecimal code 55 to facilitate message framing and synchro-
nization. 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
exact RS-232 protocol settings for both status and Home Theater
Standard 7.1 control are as follows:
9600 Baud 8 Data Bits 1 Stop Bit No Parity
The feedback system is available only through the RS-232 connector.
The status can be activated in two ways. The first is to ask for status to
be sent by sending the RS-232 command code "STAZ". The second is
to enable auto status by sending the RS-232 command code "ASTEZ".
Once the auto status command is sent, the Home Theater Standard 7.1
will transmit a status block whenever the status changes. Auto status is
disabled by sending the RS-232 command code "ASTDZ". Auto status
remains enabled until AC power is removed or turned off. When AC
power is reapplied, auto status is disabled.
Word 1: Start of Message
Bit
Description
Bit 7 – 0:
Hexadecimal 55
Word 2: General Status I
Bit
Description
Bit 7:
System Mute
1 = Internal mute is active
Bit 6:
Main Mute
1 = Main mute is active
Bit 5:
Zone 2 Mute
1 = Zone 2 mute is active
Bit 4:
Current Zone
1 = Zone 2 is active
All numeric values described in the following charts are decimal values
unless otherwise noted. The description of the eighteen 8-bit words
follow.
The values marked
Reserved
must be ignored during pattern matching.
7
6
5
4
3
2
1
0
0
1
0
1
0
1
0
1
Krell Home Theater Standard 7.1 Developer’s Reference
11
7
6
5
4
3
2
1
0
System Mute
User Mute
Zone 2 Mute
Current Zone
Input Trigger
Zone 2 Only
Zone 2 Power
Main Power
Bit 3:
Input Trigger
1 = 12V input trigger is active
Bit 2:
Zone 2 Only
1 = Only Zone 2 power is on
Bit 1:
Zone 2 Power 1 = Zone 2 power is on
Bit 0:
Main Power
1 = Main power is on