Synchronization Using Clear To Send (Cts) And Request To Send (Rts) Signals - Simrad SN90 Operator's Manual

• The systems are all connected to a common synchronization system.
• One of the acoustic systems is set up as "master", and controls the transmissions on
the other systems.
The SN90 offers functionality for remote transmit synchronization. It can be set up to
operate in either Master or Slave mode.
The following synchronization modes are available:
• Stand-alone
Synchronization is turned off.This synchronization mode is used if the SN90 is
working by itself and with no synchronization required. This is the default setting.
The SN90 operates using its internal ping interval parameters, independent of any
trigger signals arriving at the synchronization port.
The
Synchronization Delay
off.
• Master
Master mode is used if the SN90 is going to act as the controlling unit in a
synchronized system. The peripheral hydroacoustic system(s) are only permitted
to transmit when enabled by the SN90. When Master mode is selected, the SN90
will run using its internal ping interval parameters and send trigger signals to the
peripheral system(s).
This mode is unavailable if you set
• Slave
Slave mode is used if the SN90 is going to transmit only when permitted by a
peripheral system. When Slave mode is selected, the SN90 does not transmit ("ping")
unless an external trigger appears on the chosen synchronization port. The peripheral
system may be any other hydroacoustic product (for example an echo sounder or
sonar), or even a dedicated synchronization system.
Related topics
Setting up the SN90 in a synchronized system, page 148
Synchronization using Clear To Send (CTS) and Request To
Send (RTS) signals
In many applications, the synchronisation interface is based on an RS-232 serial port.
Only the Clear to Send (CTS) and Request to Send (RTS) connections of the RS-232
interface are then used.
According to the standard specifications for RS-232, an output must generate a voltage
level of +5 to +15 VDC (logic "low"), and -5 to -15 VDC (logic "high") into a load of 3
to 7 kΩ. An RS-232 receiver must present a 3 to 7 kΩ load , converting an input of +3 to
+25 VDC to logic "low", and an input of +3 to +25 VDC to logic "high". With a positive
381295/B
setting is not applicable when synchronization is switched
Synchronization Port
Operating procedures
to Transceiver Auxiliary Port.
149