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4. Programming your Application
The control of the board is by
commands
and
parameters
,
described below. You may either use them directly (see also
section D.3), or call an ActiveX (see section 4.3) that does the
work.
4.1 Commands
_ <c/r> signifies a carriage return.
Note about High Speed Commands:
Single character commands (where no <c/r> is required) are used for quick
direct access/control of the card.
Command
Action
a. Parameters: Read & write:
R
nn
<c/r>
Read parameter #
nn
.
All values are returned in floating point scientific format,
preceded by
nn
<c/r> echo and appended by a c/r. E.g.,
the answer to ‘R23<c/r>’ is ‘23<c/r>2.02<c/r>’
indicating that the value of Filter1 is 256.
W
nn
<c/r>
argument
<c/r>
(upper case W)
Write the value
argument
to parameter #
nn
.
Floating point values can either be normal or scientific
representation. For example 0.003 could be sent as it is or
as 3.0E-03.After the ‘
W
nn
<c/r>’ the board echoes
‘
nn
<c/r>’ and after the ‘
argument
<c/r>’ the board responds
‘
argument
<c/r>OK<c/r>’. For example, PC sends
‘W23<c/r>’, the board answers ‘23<c/r>, the PC then
sends ‘123<c/r>’ and the board answers
‘123<c/r>OK<c/r>’ changing Filter1 to 123.
b. Fast Mode: Start & stop
(the Fast Mode is not available with RS485):
u
(lower case u)
Start a ‘Fast Mode’ session using Filter1 (no LED update).
Terminated by the ‘x’ command.
A timer stamp is appended. Its value is the time elapsed
from start of transmission until end of transmission, in ms.
U
(upper case U)
Start a ‘Fast Mode’ session using Filter2 (no LED update).
Terminated by the ‘x’ command.
A timer stamp is appended. Its value is the time elapsed
from start of transmission until end of transmission, in ms.
x
(lower case x)
Exit Fast Mode and return to general mode.
In order to exit the fast mode, the ‘x’ command should be
synchronised, that is, issued upon receiving a block.
