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Vectrino 25
Chapter 8
Synchronizing Multiple
Instruments
The RS485 standard: RS485 is
a balanced, half duplex
transmission standard which
allows for communication over
long distances in noisy
environments.
Your Vectrino can serve as master for other Vectrinos, or its sampling can
be controlled by other sensors. This comes in handy when you need to use
several Vectrinos for a single set of measurements.
If you connect a controller to the Vectrino, you can set up a fairly
sophisticated system in which the controller can power the Vectrino and
provide it with sync pulses to control the sampling accurately. The
controller can serve as a storage device.
Note: On some older
instruments the sync lines are
labeled
Sync in and Sync out .
These should be treated as
Sync– (Sync In) and Sync+
(Sync Out).
Your Vectrino 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 are RS485 which is balanced and bi-directional
.
The sync lines are labeled Sync– and Sync+ .
Synchronizing Multiple Vectrinos
1 Connect all the Sync+ lines together and all the Sync– lines together. All
instruments should share a common ground.
2 Select one instrument as the master and the rest as slaves (Input sync) in
the software.
3 Start data collection in all slaves before starting the master. The slaves
will then wait for the first sync pulse from the master before sampling
commences.
If you use
Sample on sync
, all instruments should be configured with the
same sampling rate.