Shure P4800 User manual

Applications Group: (847) 600-8440 Shure Inc.

Fax: (847) 600-8444 5800 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:

Where

is the device ID set via the DIP switches on the P4800 unit (0 to 5), and

is the preset number minus one.

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

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