SABINE NAVIGATOR - SERIAL PROTOCOLS Manual page 3

8 20 means the command is addresed to device 0
9 20 means the command is addressed to the inputs
A 20 means the command is addressed to channel 1
B 20 means the aux value is 0 (unused for signal gain, but still required in the command string)
C 20 means the column value is 0 (unused for signal gain, but still required in the command string)
11 is the data header and means that 2 data bytes follow
21 60 is the value: 160.
1F is the execute byte
69 is the checksum
2 is the end byte
For the data value:
160 is the 0db value for gain. The range of values is 0 to 220, corresponding to gain values of -40db to +15 db in 0.25 dB
steps.
The data values are encoded as ASCII values and have a maximum value of 96, so the gain value of 160 requires 2 bytes to
represent it. It is calculated like this:
Take 160 and divide by 96: the remainder is 64, so the MS byte is 1 and the LS byte is 64. Convert the values to ASCII
representations by adding 0x20 and the result is (in hex) 21 60
For the checksum:
1. Adding up all the bytes from 0x01 to 0x1F, the raw hex checksum is 0x349.
2. AND 0x349 with 0xFF: 0x349 AND 0xFF = 0x49
3. Now take the modulus base 0x60: 0xF3 MOD 0x49 = 0x49.
4. Add 0x20 to 0x33 for the ASCII representation: 0x20+0x49=0x69. So the checksum is 0x69.
Another Example (in Hexadecimal):
This string will mute input 2 of Device 1 (zero-based):
<01><25><7F><03><4D><55><54><30><08><20><09><21><0A><22><0B><20><0C><20><08><20>
<09><20><0A><21><0B><20><0C><20><10><21><1F><CS><02>
The mute will be turned on as specified by <10><21>. Notice that the mute of Output 3 of Device 1 is not affected because
there is no <1F> right after it, so the target of the MUT0 is overridden by the second target
Another Example (in Hexadecimal):
This mutes output 3 of Device 1 and also input 2 of Device 1
<01><25><7F><03><4D><55><54><30><10><21><08><20><09><21><0A><22><0B><20><0C><20>
<1F><08><20><09><20><0A><21><0B><20><0C><20><1F><CS><02>
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