Rane SR 3 - Manual (Page 25)

Manual-25
The SR 3 always returns its address switch setting plus $80.
Note: Upon power-up of the SR 3, a status screen is displayed on the LCD display
that reports the switch setting. In firmware version >2.1, the status screen also displays
the firmware version and can be displayed any time by holding the encoder in for six
seconds. The status screen is displayed until the encoder is released. This feature is not
affected by the hardware lock, although it can be defeated by the software lock. See
ILK command in the SR 3 Command Set for details.
<msgtype> The msgtype is a one byte set of flags indicating options, bit 7=MSB:
bit 0) set = checksum is valid
bit 1) set = there has been an error (response only)
bit 2-5) reserved, cleared to 0
bit 6) always 1
bit 7) always 0
If the controller wants the SR 3 to verify the checksum, it would send a value of
$41, or an ASCII ‘A’. If the controller wants the SR 3 to ignore the checksum, it would
send a value of $40, or an ASCII ‘@’. The SR 3 echoes back the <msgtype> it was
sent. In the case of an error, the SR 3 sets bit 1.
<devtype> The SR 3 device type value is $31, or an ASCII ‘1’. The SR 3 also ac-
cepts a value of $30, or an ASCII ‘0’, the universal device type used for polling. The
SR 3 always returns its device type of $31.
<checksum> The checksum is defined as the sum of the ASCII encoded values of
the <command/data> section. The sum is then masked with $007F to produce one
byte with the MSB set to zero.
The controller would send a valid checksum as defined above if it sent a value of
$41 for the <msgtype>. The SR 3 then verifies the sent checksum by calculating the
checksum from the data it received in the <command/data> section of the sent mes-
sage. On the other hand, if the controller sent a value of $40 for the <msgtype> the
SR 3 ignores the sent checksum. The controller must always send a checksum less than
or equal to $7F, even if it intends for the SR 3 to ignore it.
The SR 3 <checksum> response is based on the <msgtype> it was sent. If the SR
3 received a <msgtype> of $41, it returns a valid checksum (as defined) calculated
from it’s response data. If the SR 3 received a <msgtype> of $40, it returns zero.
<command/data> The general format is . The
commas are part of the structure and act as delimiters between the
ASCII encoded commands and data. Text string arguments are delimited with quotes
("String"). If the string argument contains quotes, an accent character (') placed in
the string argument will be interpreted by the SR 3 as a double quote character (").
The ASCII value for the accent char is $60, not to be confused with a single quote
character ('), ASCII value $27. For example: string argument: "A string that contains
'quotes'" is interpreted as: A string that contains "quotes".