Trigger modes and appendant registers | External TTL trigger |
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TTL pulsewidth trigger for long LOW pulses
This mode is for detecting LOW pulses of an external TTL signal that are longer than a programmed pulsewidth. If the pulse is shorter than the programmed pulsewidth, no trigger will be de- tected. The board will trigger on the first pulse matching the trig- ger condition after starting the board. The next triggerevent will then be detected, if the actual recording/replay has finished and the board is armed and waiting for a trigger again.
Register | Value | Direction | Description | |
SPC_PULSEWIDTH | 44000 | r/w | Sets the pulsewidth in samples. Values from 2 to 255 are allowed. | |
SPC_TRIGGERMODE | 40000 | r/w | Sets the triggermode for the board. | |
| TM_TTLLOW_LP | 20011 | Sets the trigger mode for external TTL trigger to detect LOW pulses that are longer than a programmed pulsewidth. | |
TTL pulsewidth trigger for short LOW pulses
This mode is for detecting LOW pulses of an external TTL signal that are shorter than a programmed pulsewidth. If the pulse is longer than the programmed pulsewidth, no trigger will be detect- ed. The board will trigger on the first pulse matching the trigger condition after starting the board. The next triggerevent will then be detected, if the actual recording/replay has finished and the board is armed and waiting for a trigger again.
Register | Value | Direction | Description | |
SPC_PULSEWIDTH | 44000 | r/w | Sets the pulsewidth in samples. Values from 2 to 255 are allowed. | |
SPC_TRIGGERMODE | 40000 | r/w | Sets the triggermode for the board. | |
| TM_TTLLOW_SP | 20012 | Sets the trigger mode for external TTL trigger to detect LOW pulses that are shorter than a programmed pulsewidth. | |
SpcSetParam | (hDrv, | SPC_TRIGGERMODE, | TM_TTLHIGH_LP); // | Setting up external TTL | trigger to detect high pulses | |
SpcSetParam | (hDrv, | SPC_PULSEWIDTH , | 50 | ); // | that are longer than 50 | samples. |
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(c) Spectrum GmbH | 65 |
