Cooper Instruments & Systems DFI 1550, Communications Manual

Page: 35 / 56

CF 126 32 Nov 2001
Reply “872945" (typical)
Remarks none
FH
Write DAC Control Value
Purpose To control the channel's Digital-to-Analog Converter (DAC) manually or automatically.
Usage
"#aaccFHn
↵
"
# is the 'pound' or 'hash' character (ASCII decimal 35).
aa is the two-character instrument address
cc is the two-character channel number
n is the argument defined below.
↵
is the 'carriage return' character (ASCII decimal 13).
Argument "AUTO" returns the DAC to its normal automatic operation (power-on default).
That is, it is controlled by the "DAC. CHANNEL", "DAC. SOURCE", "DAC. ZERO-
SCALE" and "DAC. FULL-SCALE" menu items.
If the argument is a numeric value between -1 and +1, the DAC is forced to manual
control and the value is used to drive the DAC from -100% to + 100% of its output.
Example
"#0001FH.5
↵
" will force channel 01 's DAC to +50% of full-scale.
Reply "OK" or "ERROR"
Remarks You might wish to force a channel's DAC to a certain output to help calibrate the attached
data acquisition system or other device.
R5/W5
Read/Write Full-Scale Value
Purpose Reads or writes the channel's "FULL SCALE VALUE" menu item
Usage
"#aaccR5
↵
" to read, "#aaccW5n
↵
" to write.
# is the 'pound' or 'hash' character (ASCII decimal 35).
aa is the two-character instrument address.
cc is the two-character channel number
n is the full-scale value in engineering units.
↵
is the 'carriage return' character (ASCII decimal 13).
Example
"#0001W520000
↵
”
Reply When writing: "OK" or "ERROR".
When reading: an ASCll-floating-point value.
Changing this value has no effect until the channel is re-calibrated to the transducer.
R6/W6
Read/Write Units Label
Purpose Reads or writes the channel's "DISPLAY. UNITS" menu item
Usage
"#aaccR6
↵
” to read, "#aaccW6n
↵
" to write.
# is the 'pound' or 'hash' character (ASCII decimal 35).
aa is the two-character instrument address.
cc is the two-character channel number
n is the four-character units label.
↵
is the 'carriage return' character (ASCII decimal 13).
Example
"#0001W6CATS
↵
"
Reply When writing: "OK" or "ERROR".
When reading: a four-character string.
Changing this value doesn't change the mathematically scaling of the channel's values;
that can be changed by altering the "CALIBRATION DATA -> FULL -SCALE VALUE"
menu item and performing a re-calibration.
R7/W7
Read/Write Full-Scale VRMS
Purpose Reads or writes the channel's "FULL-SCALE VRMS" menu item.
Usage
"#aaccR7
↵
" to read, "#aaccW7n
↵
" to write.
# is the 'pound' or 'hash' character (ASCII decimal 35).
aa is the two-character instrument address.
cc is the two-character channel number.
n is the full-scale output of the LVDT at 3VAC excitation in units of VRMS.
n is the argument defined below.
↵
is the 'carriage return' character (ASCII decimal 13).