40
using the “ew” command, a three digit value with leading
zeros is required.
Examples:
DXD Firmware V3.xx
0000000
no calibration, ACK/NAK appended to
response, <cr> < lf> appended after ACK/
NAK, no echo, DXD Command set, Error
Status Char. On, no noise test.
00000010
same as above, only A/N appended
instead of ACK/NAK 002
00000110
A/N appended, <cr> without <lf> 006
ATS Mode Byte
0
Cal Byte
0 = no calibration
1 = self cal. Mode
1
Error Status
Don’t Care, it is disabled
Character
2
end of line
Don’t Care, it is disabled
terminator
3
echo bit
0 = command not echoed
1 = command
returned
4
Command
Must be 1 for ATS mode
bit set
5
Error Status
Must be 0 for ATS mode
Character
6
Free
7
a/d noise test 0 = no noise test
1 = noise test
performed performed
Examples:
ATS Variant
00010000
no calibration, no error status char. ATS
016
command set, no echo bit, no noise test
DETAILED EXPLANATION
OF THE “FA” & “FB” COMMANDS
The DXD offers a powerful filtering algorithm to smooth out
undesirable fluctuations or “noise” in the pressure source.
The current filter values are applied to all available engineer-
ing unit values. The filtering function has two components:
Filter Amount and Filter Band. Separate values can be set for
each, as described in the following section.
FA (Filter Amount)
The filter amount determines the number of readings aver-
aged in deriving the current pressure value. The range of
values from 01 (off) to 5 (maximum) per the following table.
Filter Amount Values.
FA
Number of
Values
Readings
01
1
02
2
03
4
04
8
05
16
To read the current value of FA of a transducer with address
01, send the following Read Command:
#01FA[cr]
The unit will respond with the following display:
FA = 01 (or whatever the current value is set to)
To change the value of FA from its current value to 05 in
a transducer with address 01, send the following Write