Comprehensive Manual98
© 2018 Nortek AS
Noise problems: If you encounter noise problems, try terminating the Sync+ line at the TTL input by
connecting a 120 ohm resistor in series with a 1nF capacitor between the Sync+ line and ground.
The best solution for external sync is using RS485 as the input/output device.
Example: Vectrino master and Vector slave
Connect ground of the two systems together
Connect Sync+ on the Vectrino to SyncInput on the Vector
Configure the Vectrino with the desired velocity range, 30 Hz sampling rate and select output sync
for Vectrino and check the box for master
Configure the Vector with the desired velocity range, continuous sampling, the next higher
available sample rate (so 32 Hz in this example) and check the boxes for start on
sync and sample on sync
Select the file name for disk recording in both software instances and make sure you also start
disk recording in both software instances at this point.
Press Start Data Collection in the Vector software
Press Start Data Collection in the Vectrino software
The measured data will now be shown on the display and stored to file, properly synchronized.
4.3.3 Vectrino Profiler
The Vectrino Profiler can serve as master for other Vectrino Profiler's, or its sampling can be
controlled by other sensors. This comes in handy if there is a need to use several Vectrino Profilers
for a single set of measurements. Note that the Vectrino Profiler can operate as a master for a
Vector, but the opposite is not possible.
If you connect a controller to the Vectrino Profiler, you can set up a fairly sophisticated system in
which the controller can power the Vectrino Profiler and provide it with sync pulses to control the
sampling accurately. The controller can serve as a storage device. The Vectrino Profiler System
Integrator Manual is a useful source for this type of applications.
The Vectrino Profiler can be synchronized with other instruments via a pair of sync lines. To avoid
noise problems and to make cabling easier, the two sync lines use an RS485 chip which is
balanced and bi-directional.
The sync lines are labeled Sync- (n) and Sync+ (p). Note that on some of the older instruments the
sync lines are labeled Sync In and Sync Out. These should be treated as Sync- (Sync In) and
Sync+ (Sync Out).
How Synchronization Works
Output Sync (operating as the master) transmits a pulse with a duration of 50 µs. The Vectrino
Profiler transmits a pulse at the end of the sampling interval and a single pulse at the beginning of
the first sampling interval to start everything when in "Master (Vectrino)" mode. When in "Master
(Other)" mode, a pulse is transmitted in the middle of each sampling interval.
Input sync triggers on the falling edge if the Sync+/Sync- signal. After each trigger the input is
discarded for the next 100 µs.
Specifications of Signal Levels
RS485 levels: These differential levels define the signal the Vectrino Profiler reads for input sync;
High level: Sync- > Sync+ by 200 mV
Low level: Sync- < Sync+ by 200 mV
Example: Synchronize Multiple Vectrino Profilers
1. Connect all the Sync+ lines together and all the Sync- lines together. All instrument should share
a common ground.
2. Select one instrument as the master and the rest as slaves (Input Sync) in the softwares.
3. Start data collection in all slaves (Click the Start Collecting data icon) before starting the master.
To Next Page
Loading...
