Port & Protocol Information
The RS232 port of the AMD4200P amplifier’s consists of three connections:
Transmit – Data from the amplifier
Receive – Data into the amplifier
GND – Ground connection
NOTE:
there are no flow control connections
The baud rate of the port is 19200 and the data format is 8 bits, no parity
and 1 stop bit (8N1).
The protocol is an ASCII protocol – all characters in the string are ASCII
characters. A binary value spanning between hexadecimal 00 and FF is
transmitted as two ASCII characters.
All command strings start with the % character and end with a carriage return
– shown as <CR> in this document and equal to the ASCII value of 13 (0x0D)
Available Parameters
The following parameters can be externally controlled:
Channel Input Cross Mix Level
Channel Input Cross Mix Mute
Channel Output Level
Channel Output Mute
Low Power Mode
Power Amplifier Fault Indication
Power Amplifier Version Information
NOTE:
the Cross Mix commands allow any of the input channels to be
mixed to a particular output channel. In effect the 2-channel versions provide
a 2x2 matrix and the 4 channel versions provide a 4x4 matrix.
NOTE:
that in the 2 channel versions, if a command is accessed with
reference to channel 3 or 4, the command will be processed but will have
no effect.
Channel Input Cross Mix Level:
To adjust the volume control of an input cross mix level.
*The Cross Mix commands allow any of the input channels to be mixed
to a particular output channel. In effect the 2-channel versions provide a
2x2 matrix and the 4 channel versions provide a 4x4 matrix.
%PCML:xyzz<CR>
In this command x represents the output channel to select (between 1 and 4)
and y represents the input channel (between 1 and 4).
The volume is represented by the zz section of the command. zz can range
between 00 (off) and E1 (225 = +12dB of gain). This allows half dB steps
throughout
the range where for example:
00 = Off
01 = -100dB
C9 = 0dB
E1 = +12dB
When a volume is adjusted the unit will reply with:
%PCML=xyzz<CR>
where x, y and zz are as per above.
To request the current level of a source:
%PVAL:xy??<CR>
where x and y are as per above.
Channel Input Cross Mix Mute
To toggle the mute control of an input cross mix mute.
%PCMM:xyzz<CR>
In this command x represents the output channel to select (between 1 and 4)
and the y represents the input channel (between 1 and 4)
The value of zz should either be 00 or 01.
00 = Unmuted
01 = Muted
If a mute flag is adjusted the unit will responded with:
%PCMM=xyzz<CR>
where x, y and zz are as per above.
To request the current value of the mute flag:
%PCMM:xy??<CR>
where x and y are as per above.
PAGE 7
AMD4200P INSTALLATION AND OPERATION MANUAL
RS232 PROTOCOL
