Shure P4800 User manual

Applications Group: [phone] Shure Inc.
Fax: [phone] Touhy Ave
Niles, IL 607 4 USA
_______________________________________________________________________________________
MICROPHONES AND ELECTRONIC COMPONENTS
Page 6/ 5/04 RW
Using t e P4800 wit AMX / Crestron Systems
Wiring
The P4800 uses a standard 7 wire RS-232 port for control. Crestron and AMX controllers use 5 wire RS-232. In order to
use a P4800 with Crestron or AMX, a custom cable will need to be built. The following diagram shows the cable. For a 5
volt supply, the resistor should be kohms.
All wires are straight through. The 9 pin connectors have numbers stamped on them. Follow those stamped numbers for
the pin out. Connect the RX, TX, GND, RTS, and CTS to the five wire RS-232 port on the control unit. The P4800 requires
a voltage of 5 to 2 volts on the DTR line. This voltage tells the microprocessor to accept any data that it receives on the
TX line.
Computer Interface – RS232 Pinout
Specifications
Baud: 9200
Data bits: 8
Stop bits:
Parity: none
Flow control: none

Page 2
P4800 RS232 Commands
CHANGING PRESETS.....................................................................................................................................................3
CHANGE SETTINGS ON P4800.......................................................................................................................................4
Inputs – Change Setting....................................................................................................................................................4
Mute.............................................................................................................................................................................4
Polarity.........................................................................................................................................................................4
+4/- 0 scaling...............................................................................................................................................................5
Volume control..............................................................................................................................................................5
Outputs – Change Settings...............................................................................................................................................6
Mute.............................................................................................................................................................................6
Polarity.........................................................................................................................................................................6
+4/- 0 scaling...............................................................................................................................................................7
Output Pad (-20 dB)......................................................................................................................................................8
Volume Control.............................................................................................................................................................8
Matrix Mixer – Change Settings ...................................................................................................................................... 0
Mute – Mixpoint.......................................................................................................................................................... 0
Mute – Mixer Output................................................................................................................................................... 0
Polarity – Mixpoint ......................................................................................................................................................
Polarity – Mixer Output ...............................................................................................................................................
Volume Control – Mixpoint..........................................................................................................................................
Volume Control – Mixer Output................................................................................................................................... 2
Activate Mixpoint (route an input to an output)............................................................................................................. 3
QUERYING THE P4800 TO FIND OUT ITS SETTINGS.................................................................................................. 4
Inputs – Query Settings................................................................................................................................................... 4
Mute........................................................................................................................................................................... 4
Polarity....................................................................................................................................................................... 4
+4/- 0 scaling............................................................................................................................................................. 4
Volume setting............................................................................................................................................................ 5
Outputs – Query Settings................................................................................................................................................ 6
Mute........................................................................................................................................................................... 6
Polarity....................................................................................................................................................................... 6
+4/- 0 scaling............................................................................................................................................................. 6
Output Pad (-20 dB).................................................................................................................................................... 7
Volume setting............................................................................................................................................................ 7
Matrix Mixer – Query Settings......................................................................................................................................... 8
Mute – Mixpoint.......................................................................................................................................................... 8
Mute – Mixer Output................................................................................................................................................... 8
Polarity – Mixpoint ...................................................................................................................................................... 8
Polarity – Mixer Output ............................................................................................................................................... 8
Volume Control – Mixpoint.......................................................................................................................................... 9
Volume Control – Mixer Output................................................................................................................................... 9
Activate Mixpoint (route an input to an output)............................................................................................................. 9

Page 3
CHANGING PRESETS
The format to change presets is as follows:
C
n h pp h
Where
n is the device ID set via the DIP switches on the P4800 unit (0 to 5), and pp is the preset number minus one. pp
has a range from 0 to 27.
For example, if the P4800 is set to device ID 5 and preset #3 is desired, the string would look like:
AMX:
SEND_STRING P4800,”$CF,$02”
Crestron (SIMPL):
\xCF\x02
Once the command is sent, the P4800 will echo the command and then send a return string to acknowledge the change.

Page 4
CHANGE SETTINGS ON P4800
Note: <Device ID> is a hexadecimal number ranging from 00h to 0Fh. This number should match the DIP switch setting
on the back of the P4800. Once a command is sent, the P4800 will echo the command and then send a return string to
acknowledge the change. The return strings can be seen in the Query section of this white paper.
Inputs – C ange Setting
Mute
Toggle Mute
Input : F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 00h 04h 00h F7h
Input 2: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 00h 05h 00h F7h
Input 3: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 00h 06h 00h F7h
Input 4: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 00h 07h 00h F7h
Force Mute
Input : F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 00h 04h 7Fh F7h
Input 2: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 00h 05h 7Fh F7h
Input 3: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 00h 06h 7Fh F7h
Input 4: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 00h 07h 7Fh F7h
Force Unmute
Input : F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 00h 04h 00h F7h
Input 2: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 00h 05h 00h F7h
Input 3: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 00h 06h 00h F7h
Input 4: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 00h 07h 00h F7h
Polarity
Toggle Polarity
Input : F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 00h 08h 00h F7h
Input 2: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 00h 09h 00h F7h
Input 3: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 00h 0Ah 00h F7h
Input 4: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 00h 0Bh 00h F7h
Force Polarity (+)
Input : F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 00h 08h 00h F7h
Input 2: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 00h 09h 00h F7h
Input 3: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 00h 0Ah 00h F7h
Input 4: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 00h 0Bh 00h F7h
Force Polarity (-)
Input : F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 00h 08h 7Fh F7h
Input 2: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 00h 09h 7Fh F7h
Input 3: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 00h 0Ah 7Fh F7h
Input 4: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 00h 0Bh 7Fh F7h

Page 5
+4/-10 scaling
Toggle
Input : F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 00h 0Ch 00h F7h
Input 2: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 00h 0Dh 00h F7h
Input 3: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 00h 0Eh 00h F7h
Input 4: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 00h 0Fh 00h F7h
Force +4 dBu scaling
Input : F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 00h 0Ch 00h F7h
Input 2: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 00h 0Dh 00h F7h
Input 3: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 00h 0Eh 00h F7h
Input 4: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 00h 0Fh 00h F7h
Force –10 dBV scaling
Input : F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 00h 0Ch 7Fh F7h
Input 2: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 00h 0Dh 7Fh F7h
Input 3: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 00h 0Eh 7Fh F7h
Input 4: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 00h 0Fh 7Fh F7h
Volume control
Set volume to a specific value
Input : F0h 00h 0 h 00h <Device ID> 0Ah 69h 00h 00h 00h <VA> F7h
Input 2: F0h 00h 0 h 00h <Device ID> 0Ah 69h 00h 00h 0 h <VA> F7h
Input 3: F0h 00h 0 h 00h <Device ID> 0Ah 69h 00h 00h 02h <VA> F7h
Input 4: F0h 00h 0 h 00h <Device ID> 0Ah 69h 00h 00h 03h <VA> F7h
where, <VA> = [ 2 * (Control Setting) ] & 7Fh
i.e., multiply the control setting by 2 and then logically AND that product with 7Fh.
The valid range for “Control Setting” is (-30) to (30). Each integer increase (or decrease) in the Control Setting is
equal to dB change.
Increase/Decrease volume by a relative amount
Input : F0h 00h 0 h 00h <Device ID> 0Ah 69h 04h 00h 00h <VA> F7h
Input 2: F0h 00h 0 h 00h <Device ID> 0Ah 69h 04h 00h 0 h <VA> F7h
Input 3: F0h 00h 0 h 00h <Device ID> 0Ah 69h 04h 00h 02h <VA> F7h
Input 4: F0h 00h 0 h 00h <Device ID> 0Ah 69h 04h 00h 03h <VA> F7h
where, <VA> = [2 * (dB Change) ] & 7Fh
i.e., multiply the amount of change (in dB) by 2 and then logically AND that product with 7Fh. For
example, to decrease the volume by 2 dB:
<VA> = [2 * (-2)] & 7Fh
<VA> = [-4] & 7Fh
<VA> = 7Ch
It is not necessary to calculate this equation by hand. Both AMX and Crestron can be programmed to calculate
this equation.

Page 6
Outputs – C ange Settings
Mute
Toggle mute
Output : F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 03h 46h 00h F7h
Output 2: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 03h 47h 00h F7h
Output 3: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 03h 48h 00h F7h
Output 4: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 03h 49h 00h F7h
Output 5: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 03h 4Ah 00h F7h
Output 6: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 03h 4Bh 00h F7h
Output 7: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 03h 4Ch 00h F7h
Output 8: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 03h 4Dh 00h F7h
Force mute
Output : F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 46h 7Fh F7h
Output 2: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 47h 7Fh F7h
Output 3: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 48h 7Fh F7h
Output 4: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 49h 7Fh F7h
Output 5: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 4Ah 7Fh F7h
Output 6: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 4Bh 7Fh F7h
Output 7: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 4Ch 7Fh F7h
Output 8: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 4Dh 7Fh F7h
Force unmute
Output : F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 46h 00h F7h
Output 2: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 47h 00h F7h
Output 3: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 48h 00h F7h
Output 4: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 49h 00h F7h
Output 5: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 4Ah 00h F7h
Output 6: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 4Bh 00h F7h
Output 7: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 4Ch 00h F7h
Output 8: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 4Dh 00h F7h
Polarity
Toggle polarity
Output : F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 03h 4Eh 00h F7h
Output 2: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 03h 4Fh 00h F7h
Output 3: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 03h 50h 00h F7h
Output 4: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 03h 5 h 00h F7h
Output 5: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 03h 52h 00h F7h
Output 6: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 03h 53h 00h F7h
Output 7: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 03h 55h 00h F7h
Output 8: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 03h 55h 00h F7h

Page 7
Force polarity (+)
Output : F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 4Eh 00h F7h
Output 2: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 4Fh 00h F7h
Output 3: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 50h 00h F7h
Output 4: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 5 h 00h F7h
Output 5: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 52h 00h F7h
Output 6: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 53h 00h F7h
Output 7: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 55h 00h F7h
Output 8: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 55h 00h F7h
Force polarity (-)
Output : F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 4Eh 7Fh F7h
Output 2: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 4Fh 7Fh F7h
Output 3: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 50h 7Fh F7h
Output 4: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 5 h 7Fh F7h
Output 5: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 52h 7Fh F7h
Output 6: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 53h 7Fh F7h
Output 7: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 55h 7Fh F7h
Output 8: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 55h 7Fh F7h
+4/-10 scaling
Toggle scaling
Output : F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 03h 56h 00h F7h
Output 2: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 03h 57h 00h F7h
Output 3: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 03h 58h 00h F7h
Output 4: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 03h 59h 00h F7h
Output 5: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 03h 5Ah 00h F7h
Output 6: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 03h 5Bh 00h F7h
Output 7: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 03h 5Ch 00h F7h
Output 8: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 03h 5Dh 00h F7h
Force +4 dBu scaling
Output : F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 56h 00h F7h
Output 2: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 57h 00h F7h
Output 3: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 58h 00h F7h
Output 4: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 59h 00h F7h
Output 5: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 5Ah 00h F7h
Output 6: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 5Bh 00h F7h
Output 7: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 5Ch 00h F7h
Output 8: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 5Dh 00h F7h
Force –10 dBV scaling
Output : F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 56h 7Fh F7h
Output 2: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 57h 7Fh F7h
Output 3: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 58h 7Fh F7h
Output 4: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 59h 7Fh F7h
Output 5: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 5Ah 7Fh F7h
Output 6: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 5Bh 7Fh F7h
Output 7: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 5Ch 7Fh F7h
Output 8: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 5Dh 7Fh F7h

Page 8
Output Pad (-20 dB)
Toggle pad
Output : F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 03h 5Eh 00h F7h
Output 2: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 03h 5Fh 00h F7h
Output 3: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 03h 60h 00h F7h
Output 4: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 03h 6 h 00h F7h
Output 5: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 03h 62h 00h F7h
Output 6: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 03h 63h 00h F7h
Output 7: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 03h 64h 00h F7h
Output 8: F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 03h 65h 00h F7h
Force pad off
Output : F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 5Eh 00h F7h
Output 2: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 5Fh 00h F7h
Output 3: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 60h 00h F7h
Output 4: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 6 h 00h F7h
Output 5: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 62h 00h F7h
Output 6: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 63h 00h F7h
Output 7: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 64h 00h F7h
Output 8: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 65h 00h F7h
Force pad on
Output : F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 5Eh 7Fh F7h
Output 2: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 5Fh 7Fh F7h
Output 3: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 60h 7Fh F7h
Output 4: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 6 h 7Fh F7h
Output 5: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 62h 7Fh F7h
Output 6: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 63h 7Fh F7h
Output 7: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 64h 7Fh F7h
Output 8: F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 03h 65h 7Fh F7h
Volume Control
Set volume to a specific value
Output : F0h 00h 0 h 00h <Device ID> 0Ah 69h 00h 03h 3Eh <VA> F7h
Output 2: F0h 00h 0 h 00h <Device ID> 0Ah 69h 00h 03h 3Fh <VA> F7h
Output 3: F0h 00h 0 h 00h <Device ID> 0Ah 69h 00h 03h 40h <VA> F7h
Output 4: F0h 00h 0 h 00h <Device ID> 0Ah 69h 00h 03h 4 h <VA> F7h
Output 5: F0h 00h 0 h 00h <Device ID> 0Ah 69h 00h 03h 42h <VA> F7h
Output 6: F0h 00h 0 h 00h <Device ID> 0Ah 69h 00h 03h 43h <VA> F7h
Output 7: F0h 00h 0 h 00h <Device ID> 0Ah 69h 00h 03h 44h <VA> F7h
Output 8: F0h 00h 0 h 00h <Device ID> 0Ah 69h 00h 03h 45h <VA> F7h
where, <VA> = [ 2 * (Control Setting) ] & 7Fh
i.e., multiply the control setting by 2 and then logically AND that product with 7Fh.
The valid range for “Control Setting” is (-30) to (30). Each integer increase (or decrease) in the Control Setting is
equal to dB change.

Page 9
Increase/Decrease volume by a relative amount
Output : F0h 00h 0 h 00h <Device ID> 0Ah 69h 04h 03h 3Eh <VA> F7h
Output 2: F0h 00h 0 h 00h <Device ID> 0Ah 69h 04h 03h 3Fh <VA> F7h
Output 3: F0h 00h 0 h 00h <Device ID> 0Ah 69h 04h 03h 40h <VA> F7h
Output 4: F0h 00h 0 h 00h <Device ID> 0Ah 69h 04h 03h 4 h <VA> F7h
Output 5: F0h 00h 0 h 00h <Device ID> 0Ah 69h 04h 03h 42h <VA> F7h
Output 6: F0h 00h 0 h 00h <Device ID> 0Ah 69h 04h 03h 43h <VA> F7h
Output 7: F0h 00h 0 h 00h <Device ID> 0Ah 69h 04h 03h 44h <VA> F7h
Output 8: F0h 00h 0 h 00h <Device ID> 0Ah 69h 04h 03h 45h <VA> F7h
where, <VA> = [2 * (dB Change) ] & 7Fh
i.e., multiply the amount of change (in dB) by 2 and then logically AND that product with 7Fh. For
example, to decrease the volume by 2 dB:
<VA> = [2 * (-2)] & 7Fh
<VA> = [-4] & 7Fh
<VA> = 7Ch
It is not necessary to calculate this equation by hand. Both AMX and Crestron can be programmed to calculate
this equation.

Page 0
Matrix Mixer – C ange Settings
The matrix mixer signal processor in the P4800 unit has 4 inputs and N outputs (NOUTPUTS). When there is no cross
over processor or splitter in the preset, N is 8, i.e. a 4 x 8 mixer. If there is a cross over or splitter, N is reduced by the
number of cross over/splitter channels minus one.
For example: One 3-way cross over in the preset makes the matrix mixer a 4 x 6 mixer.
NMIXPOINTS is defined as:
NMIXPOINTS = 4 * NOUTPUTS
Therefore, a 4 x 8 mixer has 32 mixpoints (NMIXPOINTS=32), a 4x6 has 24 mixpoints (NMIXPOINTS=24).
Mix Point gain is input channel gain for matrix mixer output
Mix Point 2 gain is input channel 2 gain for matrix mixer output
Mix Point 3 gain is input channel 3 gain for matrix mixer output
Mix Point 4 gain is input channel 4 gain for matrix mixer output
Mix Point 5 gain is input channel gain for matrix mixer output 2
Etc.
Mute – Mixpoint
Note: <ID> = NMIXPOINTS + 5 + (Mix Point #)
Toggle Mute
F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 00h <ID> 00h F7h
Force Mute
F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 00h <ID> 7Fh F7h
Force Unmute
F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 00h <ID> 00h F7h
Mute – Mixer Output
Note: The <IDMSB> and <IDLSB> values must be calculated as follows:
<IDMSB> = [((4 * NMIXPOINTS) + NOUTPUTS + 5 + (NOutput #)) >> 7] & 7Fh
<IDLSB> = ((4 * NMIXPOINTS) + NOUTPUTS + 5 + (NOutput #)) & 7Fh
where “>> 7” means right shift by 7 bits and “&” denotes logical AND.
Toggle Mute (BUG – DOES NOT WORK)
F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h <IDMSB> <IDLSB> 00h F7h
Force Mute
F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h <IDMSB <IDLSB> 7Fh F7h

Page
Force Unmute
F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h <IDMSB> <IDLSB> 00h F7h
Polarity – Mixpoint
Note: <ID> = (2 * NMIXPOINTS) + 5 + (Mix Point #)
Toggle Polarity
F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h 00h <ID> 00h F7h
Force Polarity (+)
F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 00h <ID> 00h F7h
Force Polarity (-)
F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h 00h <ID> 7Fh F7h
Polarity – Mixer Output
Note: The <IDMSB> and <IDLSB> values must be calculated as follows:
<IDMSB> = [((4 * NMIXPOINTS) + (2 * NOUTPUTS) + 5 + (NOutput #)) >> 7] & 7Fh
<IDLSB> = ((4 * NMIXPOINTS) + (2 * NOUTPUTS) + 5 + (NOutput #)) & 7Fh
where “>> 7” means right shift by 7 bits and “&” denotes logical AND.
Toggle Polarity (BUG – DOES NOT WORK)
F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h <IDMSB> <IDLSB> 00h F7h
Force Polarity (+)
F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h <IDMSB> <IDLSB> 00h F7h
Force Polarity (-)
F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h <IDMSB> <IDLSB> 7Fh F7h
Volume Control – Mixpoint
Note: <ID> = (Mix Point #) + 5
Set volume to a specific value
F0h 00h 0 h 00h <Device ID> 0Ah 69h 00h 00h <ID> <VA> F7h
where, <VA> = (Control Setting) & 7Fh
i.e., logically AND the control setting with 7Fh.

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The valid range for “Control Setting” is (0) to ( 27) from the following table.
Control Setting
<VA> Gain value (dB)
0 -Infinity
-26 - 05 to –42.5,
in 2.5 dB steps
27- 27 -40.0 to + 0.0,
in 0.5 dB steps
Increase/Decrease volume by a relative amount
F0h 00h 0 h 00h <Device ID> 0Ah 69h 05h 00h <ID> <VA> F7h
where, <VA> = [2 * (dB Change) ] & 7Fh
i.e., multiply the amount of change (in dB) by 2 and then logically AND that product with 7Fh.
Volume Control – Mixer Output
Note: The <IDMSB> and <IDLSB> values must be calculated as follows:
<IDMSB> = [((4 * NMIXPOINTS) + 5 + (NOutput #)) >> 7] & 7Fh
<IDLSB> = ((4 * NMIXPOINTS) + 5 + (NOutput #)) & 7Fh
where “>> 7” means right shift by 7 bits and “&” denotes logical AND.
Set volume to a specific value
F0h 00h 0 h 00h <Device ID> 0Ah 69h 00h <IDMSB> <IDLSB> <VA> F7h
where, <VA> = (Control Setting) & 7Fh
i.e., logically AND the control setting with 7Fh.
The valid range for “Control Setting” is (0) to ( 27) from the following table.
Control Setting
<VA> Gain value (dB)
0 -Infinity
-26 - 05 to –42.5,
in 2.5 dB steps
27- 27 -40.0 to + 0.0,
in 0.5 dB steps
Increase/Decrease volume by a relative amount (BUG – DOES NOT WORK)
F0h 00h 0 h 00h <Device ID> 0Ah 69h 05h <IDMSB> <IDLSB> <VA> F7h
where, <VA> = [2 * (dB Change) ] & 7Fh
i.e., multiply the amount of change (in dB) by 2 and then logically AND that product with 7Fh.

Page 3
Activate Mixpoint (route an input to an output)
Note: The <IDMSB> and <IDLSB> values must be calculated as follows:
<IDMSB> = [((3 * NMIXPOINTS) + 5 + (Mix Point #)) >> 7] & 7Fh
<IDLSB> = ((3 * NMIXPOINTS) + 5 + (Mix Point #)) & 7Fh
where “>> 7” means right shift by 7 bits and “&” denotes logical AND.
Toggle Activation (BUG – DOES NOT WORK)
F0h 00h 0 h 00h <Device ID> 0Ah 69h 06h <IDMSB> <IDLSB> 00h F7h
Force Activation
F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h <IDMSB> <IDLSB> 7Fh F7h
Force Deactivation
F0h 00h 0 h 00h <Device ID> 0Ah 69h 0 h <IDMSB> <IDLSB> 00h F7h

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QUERYING THE P4800 TO FIND OUT ITS SETTINGS
The following list of commands can be sent to the P4800 to query the status of its settings. After the query command is
sent, the P4800 will first send an echo of the query command and then it will send a return string with the status of the
particular setting.
Inputs – Query Settings
Mute
Note: <VA> equals 00h when the input is unmuted and equals 7Fh when the input is muted.
Input : Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 00h 04h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 00h 04h <VA> 00h F7h
Input 2: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 00h 05h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 00h 05h <VA> 00h F7h
Input 3: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 00h 06h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 00h 06h <VA> 00h F7h
Input 4: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 00h 07h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 00h 07h <VA> 00h F7h
Polarity
Note: <VA> equals 00h when the input is (+) polarity and equals 0 h when the input is (-) polarity.
Input : Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 00h 08h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 00h 08h <VA> 00h F7h
Input 2: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 00h 09h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 00h 09h <VA> 00h F7h
Input 3: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 00h 0Ah F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 00h 0Ah <VA> 00h F7h
Input 4: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 00h 0Bh F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 00h 0Bh <VA> 00h F7h
+4/-10 scaling
Note: <VA> equals 00h when the input is +4 dBu scaling and equals 0 h when the input is – 0 dBV scaling.
Input : Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 00h 0Ch F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 00h 0Ch <VA> 00h F7h
Input 2: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 00h 0Dh F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 00h 0Dh <VA> 00h F7h
Input 3: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 00h 0Eh F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 00h 0Eh <VA> 00h F7h
Input 4: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 00h 0Fh F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 00h 0Fh <VA> 00h F7h

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Volume setting
Note: <VA> equals an integer from –60 to +60. Divide <VA> by 2 to get to a dB scale.
Input : Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 00h 00h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 00h 00h <VA> 00h F7h
Input 2: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 00h 0 h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 00h 0 h <VA> 00h F7h
Input 3: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 00h 02h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 00h 02h <VA> 00h F7h
Input 4: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 00h 03h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 00h 03h <VA> 00h F7h

Page 6
Outputs – Query Settings
Mute
Note: <VA> equals 00h when the output is unmuted and equals 7Fh when the output is muted.
Output : Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 46h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 46h <VA> 00h F7h
Output 2: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 47h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 47h <VA> 00h F7h
Output 3: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 48h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 48h <VA> 00h F7h
Output 4: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 49h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 49h <VA> 00h F7h
Output 5: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 4Ah F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 4Ah <VA> 00h F7h
Output 6: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 4Bh F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 4Bh <VA> 00h F7h
Output 7: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 4Ch F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 4Ch <VA> 00h F7h
Output 8: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 4Dh F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 4Dh <VA> 00h F7h
Polarity
Note: <VA> equals 00h when the output is (+) polarity and equals 0 h when the output is (-) polarity.
Output : Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 4Eh F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 4Eh <VA> 00h F7h
Output 2: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 4Fh F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 4Fh <VA> 00h F7h
Output 3: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 50h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 50h <VA> 00h F7h
Output 4: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 5 h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 5 h <VA> 00h F7h
Output 5: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 52h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 52h <VA> 00h F7h
Output 6: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 53h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 53h <VA> 00h F7h
Output 7: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 54h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 54h <VA> 00h F7h
Output 8: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 55h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 55h <VA> 00h F7h
+4/-10 scaling
Note: <VA> equals 00h when the output is +4 dBu scaling and equals 0 h when the output is – 0 dBV scaling.
Output : Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 56h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 56h <VA> 00h F7h
Output 2: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 57h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 57h <VA> 00h F7h
Output 3: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 58h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 58h <VA> 00h F7h
Output 4: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 59h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 59h <VA> 00h F7h

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Output 5: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 5Ah F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 5Ah <VA> 00h F7h
Output 6: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 5Bh F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 5Bh <VA> 00h F7h
Output 7: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 5Ch F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 5Ch <VA> 00h F7h
Output 8: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 5Dh F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 5Dh <VA> 00h F7h
Output Pad (-20 dB)
Note: <VA> equals 00h when the output pad is not engaged and equals 0 h when the output pad is engaged.
Output : Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 5Eh F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 5Eh <VA> 00h F7h
Output 2: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 5Fh F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 5Fh <VA> 00h F7h
Output 3: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 60h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 60h <VA> 00h F7h
Output 4: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 6 h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 6 h <VA> 00h F7h
Output 5: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 62h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 62h <VA> 00h F7h
Output 6: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 63h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 63h <VA> 00h F7h
Output 7: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 64h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 64h <VA> 00h F7h
Output 8: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 65h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 65h <VA> 00h F7h
Volume setting
Note: <VA> equals an integer from –60 to +60. Divide <VA> by 2 to get to a dB scale.
Output : Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 3Eh F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 3Eh <VA> 00h F7h
Output 2: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 3Fh F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 3Fh <VA> 00h F7h
Output 3: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 40h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 40h <VA> 00h F7h
Output 4: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 4 h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 4 h <VA> 00h F7h
Output 5: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 42h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 42h <VA> 00h F7h
Output 6: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 43h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 43h <VA> 00h F7h
Output 7: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 44h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 44h <VA> 00h F7h
Output 8: Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 03h 45h F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 03h 45h <VA> 00h F7h

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Matrix Mixer – Query Settings
Mute – Mixpoint
Note: <VA> equals 00h when the mixpoint is unmuted and equals 7Fh when the mixpoint is muted.
<ID> = NMIXPOINTS + 5 + (Mix Point #)
Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 00h <ID> F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 00h <ID> <VA> 00h F7h
Mute – Mixer Output
Note: <VA> equals 00h when the mixer output is unmuted and equals 7Fh when the mixer output is muted.
The <IDMSB> and <IDLSB> values must be calculated as follows:
<IDMSB> = [((4 * NMIXPOINTS) + NOUTPUTS + 5 + (NOutput #)) >> 7] & 7Fh
<IDLSB> = ((4 * NMIXPOINTS) + NOUTPUTS + 5 + (NOutput #)) & 7Fh
where “>> 7” means right shift by 7 bits and “&” denotes logical AND.
Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h <IDMSB> <IDLSB> F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h <IDMSB> <IDLSB> <VA> 00h F7h
Polarity – Mixpoint
Note: <VA> equals 00h when the mixpoint is (+) polarity and equals 0 h when the mixpoint is (-) polarity.
<ID> = (2 * NMIXPOINTS) + 5 + (Mix Point #)
Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 00h <ID> F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 00h <ID> <VA> 00h F7h
Polarity – Mixer Output
Note: <VA> equals 00h when the mixer output is (+) polarity and equals 0 h when the mixer output is (-) polarity.
The <IDMSB> and <IDLSB> values must be calculated as follows:
<IDMSB> = [((4 * NMIXPOINTS) + (2 * NOUTPUTS) + 5 + (NOutput #)) >> 7] & 7Fh
<IDLSB> = ((4 * NMIXPOINTS) + (2 * NOUTPUTS) + 5 + (NOutput #)) & 7Fh
where “>> 7” means right shift by 7 bits and “&” denotes logical AND.
Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h <IDMSB> <IDLSB> F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h <IDMSB> <IDLSB> <VA> 00h F7h

Page 9
Volume Control – Mixpoint
Note: <ID> = (Mix Point #) + 5
<VA> equals the settings in the following table.
<VA> Gain value (dB)
0 -Infinity
-26 - 05 to –42.5,
in 2.5 dB steps
27- 27 -40.0 to + 0.0,
in 0.5 dB steps
Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h 00h <ID> F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h 00h <ID> <VA> 00h F7h
Volume Control – Mixer Output
Note: The <IDMSB> and <IDLSB> values must be calculated as follows:
<IDMSB> = [((4 * NMIXPOINTS) + 5 + (NOutput #)) >> 7] & 7Fh
<IDLSB> = ((4 * NMIXPOINTS) + 5 + (NOutput #)) & 7Fh
where “>> 7” means right shift by 7 bits and “&” denotes logical AND.
<VA> equals the settings in the following table.
<VA> Gain value (dB)
0 -Infinity
-26 - 05 to –42.5,
in 2.5 dB steps
27- 27 -40.0 to + 0.0,
in 0.5 dB steps
Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h <IDMSB> <IDLSB> F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h <IDMSB> <IDLSB> <VA> 00h F7h
Activate Mixpoint (route an input to an output)
Note: <VA> equals 00h when the mixpoint is not activated and equals 0 h when the mixpoint is activated.
The <IDMSB> and <IDLSB> values must be calculated as follows:
<IDMSB> = [((3 * NMIXPOINTS) + 5 + (Mix Point #)) >> 7] & 7Fh
<IDLSB> = ((3 * NMIXPOINTS) + 5 + (Mix Point #)) & 7Fh
where “>> 7” means right shift by 7 bits and “&” denotes logical AND.
Query command: F0h 00h 0 h 00h <Device ID> 0Ah 70h <IDMSB> <IDLSB> F7h
Return string: F0h 00h 0 h 00h <Device ID + 0h> 0Ah 00h <IDMSB> <IDLSB> <VA> 00h F7h