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OPM3609-002C
November 1993
OPM3609-002C
November 1993
TERMINAL.EXE program may be used to communicate with
and operate the FASTRAK instrument. Please note:
Once you have established the transmitter/receiver
configuration and set the Selector Switch, the
configuration is set until you change it. If at any
time you decide to change the configuration or add
additional or new receivers/transmitters, it must be
accomplished with power OFF as receiver/transmitter
characterization data is only read at power up.
Failure to do this will result in erroneous data.
6.3
Power-Up
The FASTRAK has a power on switch. To power-up
your instrument first ensure that the power supply is
not plugged into the AC. Then connect the power cable
from the Power Supply to the DIN power connector on
the rear panel of the instrument. Plug the Power
Supply into the AC outlet and turn the Power Switch to
the ON position. On power up, the power indicator
will blink for approximately 10 seconds to indicate
the instrument's performance of an initialization and
self test routine. During this time instrument
operation is not possible. At the completion of this
routine, the power indicator will change from a
"blink" state to "steady-on" which indicates that the
instrument is now operational.
6.4
Output Considerations
Operating the instrument consists of issuing
commands over either I/O port from the host to control
the instrument's performance characteristics and
observing and/or utilizing the resulting outputs. The
most important parameters describing the instrument's
performance are latency, speed, accuracy and
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resolution. Definitive treatment of these parameters
is contained in two application notes found in
Appendices B and C of this document. They are
entitled: "ACCURACY AND RESOLUTION IN ELECTROMAGNETIC
SIX-DEGREE-OF-FREEDOM MEASUREMENT SYSTEMS", and
"Technical Note LATENCY - 3SPACE® FASTRAK."
From an operational point of view relative to the
instrument output, latency must be considered with
respect to baud rate, output record length and
filtering. The combination of baud rate, record
length and filtering collectively define the data
transfer time. Depending on the baud rate, record
length and filtering chosen, longer than specified
latency, exclusive of data transfer time, will occur.
If the data transfer time is longer than the
instrument's cycle time and data queuing is invoked in
the output buffer, an output data record may be
skipped. For example: if the instrument is operated
in continuous print mode ("C" command) and the data
transfer time is longer than the cycle time, the
instrument will skip a data record or queue the data
for output depending on the output buffer availability
for the RS-232 port only. For the IEEE-488 port,
however, output is immediate if the output buffer is
available; if not, the data record is skipped.
Additionally, if more than one receiver is in use, the
receiver output sequence will not be compromised due
to output buffer availability. If output data is
requested with the "P" command (single record),
regardless of the I/O port employed, and the time
between requests is less than the instrument cycle
time, no delays will result from queuing and no data
record skipping will occur since only one full data
record at a time will reside in the output buffer.
6.5
Synchronization and Multiple Systems
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