Technical specifications
Figure 2
Typical sequence
When the TRU is ready for a new ping, RTS is set to H. When
the external device is ready for a new ping, CTS shall be changed
to H. The CTS must be high for minimum 100 microseconds.
The TRU will then change RTS to L (busy), issue a Trig out
signal (will be low for 1 millisecond) to indicate the start of the
transmit pulses, and then transmit the TX pulses. After the Trig
out is received, the external device should turn CTS back to L.
When the receive period is finished and the TRU is ready for a
new ping, the RTS will be changed to H, and the TRU will wait
for a new trigger (a high level on CTS). If CTS is H all the time,
or if external sync in the installation menu is switched off, the
TRU will ping at its maximum rate.
Remote on/off
The TRU on/off function can be remotely controlled. The TRU
is turned on by connecting pin 4 and 5 in the TRU remote plug
together.
on page 138
3.6.1 Clock sync 1 PPS
The 1 PPS (on pulse per second) signal is connected to the coax
connector on the BSP RIO board. The BSP RIO is equipped with
an optocoupler at this input. The input series resistor is tuned for
a TTL signal (Low level<0.6 V, High level>3.2 V). The falling
edge of the signal is used by the TRU to synchronize the internal
clock. The 1 PPS signal must be minimum 1 microsecond long.
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