24
MPS4264
Section 3: Operation
software trigger. For each trigger pulse, the MPS
will return a single frame of data
Setting up an External Scan Trigger
To configure the MPS4264 to scan with an external scan
trigger:
1. Set the variable “TRIG” to 2
2. Set the “RATE” variable to the desired data collec-
tion rate
3. Supply a “high” voltage (5Vdc<voltage<15Vdc). The
MPS will collect data at the defined rate until the
trigger input voltage is lowered below the 5Vdc
trigger level.
Auto Scan Option
When TRIG is set to 3, the Auto Scan feature is enabled.
This commands the MPS4000 to start scanning after the
power up sequence has completed. The type of scan data
output to the FTP server is set according to the format
settings (CSV, ASCII or Binary). Setting TRIG to a 3 overrides
the ENFTP setting because the only output available when
auto scan is enabled is the FTP server.
When the FTP server is not ready to handle a connection
from the MPS4264, the MPS will continue to attempt to
connect until it succeeds, a STOP command is received
from the serial interface or a STOP is received from the
network interface. Stopping the auto scan by connecting
with Telnet and issuing a STOP command is the preferred
method used to change the TRIG setting from 3 when other
trigger options are desired.
Once scanning is started, it continues until a STOP is
received, as described above. Simply shutting off the MPS
will stop the sending of data to the FTP server. Normally
this will cause the FTP server to begin a time out period
waiting for data. After the time out period, the FTP server
should close the connection, flush any unsaved data to disk
and close the file. The time out period of the FTP server is
usually configurable. FTP servers may vary in their opera-
tion so check your FTP server manual for settings.
Statistical Scan Option
The MPS4264 includes and integrated function for
analyzing the pressure data and providing statistical infor-
mation on the data in real time. The MPS can output seven
statistical parameters. They are: rolling average, rolling
maximum, rolling minimum, rolling RMS, rolling standard
deviation, rolling average excluding outliers at 3 sigma
and number of overloads. The original data is also output.
Because of the significant increase in data and processor
load, the Statistical Scan option limits the overall data
output rate to 25Hz/channel with a buffer depth of 256.
All calculations exclude overloads where an overload
is 150% of highest or lowest value in table. A list of the
current overload value is found for each channel through
the MXMN command (see “Max-Min Calibration Table
Values” on page 49 for more information on the MXMN
command.)
To configure statistical scan data a SET FORMAT of param-
eter B to S is required for data to be sent out the binary
server port or parameter F to S is required for data to be
sent out to the FTP server (see “Set Scanning Data Format
(FORMAT)” on page 55 for more information on the
FORMAT variable.) Statistical data is delivered to the web
browser by clicking on the Statistical Scan link.
The depth of the subset FIFO is set via the SET OPTIONS
<fast scan> <read mode> <sub set depth> variable in the
LIST S group (see “Set Options (OPTIONS)” on page 56
for more information on the OPTIONS variable.) The valid
range is from 2 to 256.
The packet format for a statistical packet is shown in “Table
5-6: Statistical Binary Data Format” on page 38.
When a client is connected to the binary server port,
statistical scan data is send out from the binary server port.
A web browser must not be connected and the FORMAT
variable must be set to S. The packet format is the same
a shown in “Table 5-6: Statistical Binary Data Format” on
page 38. Scanning may be started via the Telnet connec-
tion with either a SCAN or MSCAN command when a binary
client is connected. Data is sent out the binary server port.
Fast Scan Option (850Hz - 2500Hz)
Fast scan allows the MPS4264 to scan a reduced number
of channels at a faster rate than is possible with all 64
channels. The set of reduced channels for a fast scan is 16
channels.
Not just any channel can be placed in the 16 channel fast
scan group. Fast scan mode reduces the channel count
down to one channel per A/D converter. Because of the
association between channel numbers and A/Ds, the 16
channel fast scan group must contain 16 channels and start
with channel 1, 2, 3 or 4. The channels that are part of each
16 channel fast scan group are shown in the table below.
To enable “Fast Scan” mode, the first term of the OPTIONS
variable is set to the desired starting channel number.
The setting of the first term of the OPTIONS variable will
Summary of Contents for MPS4264
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