Integrators Guide - Light 99
© 2018 Nortek AS
The slaves will then wait for the first sync pulse from the master before the sampling commences.
If you use Sample on sync, all instruments should be configured with the same sampling rate.
Example: Synchronizing form a TTL source
TTL signal levels can be mixed with the RS485 levels of the Vectrino Profiler.
1. Connect your sync pulse (0-V volts) to Sync- and connect Sync+ to a constant voltage V/2
(Where V is the ON voltage of the sync pulse). This provides a defined transition when the TTL
signal changes, which is not the case if you ground Sync+. The Sync inputs are diode limited to
5V through a 4.7 ohm resistor. Input voltages above 5V are not recommended for use.
2. When the Vectrino Profiler functions as master, the Sync- line can be connected to the TTL input
and the two systems must be connected to share common ground.
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 the ground.
The best solution for external sync is using RS485 as the input/output device.
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