G.R.A.S. SOUND & VIBRATION
Power Module Type 12AQ
Page 14
4 .3 Behaviour
Whenever the Type 12AQ is powered up, it waits for about 1 second before responding with the
following message:
Ready
The Type 12AQ has no default mode and powers up with the settings it had when last switch
off
1
:
4 .4 Commands and Responses
About commands:
Two types of command are used. These are:
1. Setup commands
which are for changing the setup parameters of the Type 12AQ.
2. Special commands
which return information about the Type 12AQ and control its mode of flagging over
loads.
Syntax:
1. Commands are not case sensitive.
2. Where applicable, a single space separates a command from its argument.
e.g.
gain 10
(set gain to 10 dB).
3. All commands are executed by first typing in the command then striking the <Enter>
2
key
(usually symbolised nowadays by “
”), e.g.:
HP
...if you want to set the high-pass filter of the conditioning amplifier to 20 Hz.
For clarity, <Enter> and “
” are implied if not shown in the following.
About responses:
1. All responses are followed by <CRLF>
3
.
2. Successfully executed commands respond with
OK
<CRLF>.
3. Illegal commands respond with an error message, e,g:
Error command not found: XYZ A
(where
XYZ A
is an illegal command, argu-
ment or both).
For clarity, <CRLF> is implied in the following.
4 .4 .1 Setup commands
These are for setting up the signal conditioning requirements and reflect more or less what can
also be done via the front-panel switches and buttons.
Channel selection/deselection
These commands can be used to select/deselect channels which are to be affected/unaffected
by subsequent commands. Its a means of addressing one particular channel instead of both.
Command
Effect
ch
Displays currently-selected channel no(s).
ch #+
Selects channel # if currently deselected (# is 1 or 2).
ch #-
Deselects channel # if currently selected (# is 1 or 2).
ch *
Selects any currently-deselected channel(s).
1
With some exceptions, e.g. the command
ovlled n
which should be used with care.
2
The equivalent of <CRLF> i.e. “Carriage Return Line Feed”. However, the commands ignore the <LF>.
3
“Carriage Return Line Feed” which moves the cursor to the start of a new line.
