Commands
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5.13.2 Triggers
AD2CP offers four main types of triggers: Internal Sampling, TTL trigger, RS-485 trigger and trig on
command.
Internal Sampling (INTSR)
Internal triggers determined by the selected sampling rate.
TTL Trigger
The AD2CP can trig on either Rising Edge, Falling Edge or Both Edges of a TTL Signal. When triggered
the instrument will perform a complete ping (Tx and Rx) before it goes back to monitoring the trigger.
Any triggers asserted during an ongoing ping will be ignored. The requirements for the TTL input is Vlow
<0.7V and Vhigh>2.5V. The TTL input tolerate voltages between 0-5.5 V. The pulse length should be
minimum 1 ms.
DVL trigger types
RS-485 Trigger
A RS-485 signal can be used to trig the AD2CP, either Rising Edge, Falling Edge or Both Edges of a
RS-485 Signal. The following figure shows the polarities of the differential RS-485 signal pair for the
trigger types. When triggered the instrument will perform a complete ping (Tx and Rx) before it goes
back to monitoring the trigger. Any triggers asserted during an ongoing ping will be ignored. The pulse
length should be minimum 1 ms.
DVL RS-485 Trigger types
Trig on Command
When the TRIG parameter of the SETTRIG command is set to “COMMAND” the AD2CP is trigged by
sending a “TRIG[CrLf]” command. The trigger time will be when the end of the [CrLf] is received.
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