Spectrum Brands MI.61XX 用户手册
Trigger modes and appendant registers
External TTL trigger
(c) Spectrum GmbH
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As the trigger connector is used as an input, you can decide whether the input is 50 Ohm terminated or not. If you enable the termination,
please make sure, that your trigger source is capable to deliver the desired current. If termination is disabled, the input is at high impedance.
please make sure, that your trigger source is capable to deliver the desired current. If termination is disabled, the input is at high impedance.
The following short example shows how to set up the board for external positive edge TTL trigger. The trigger input is 50 Ohm terminated.
The different modes for external TTL trigger are to be detailed described in the next few passages.
The different modes for external TTL trigger are to be detailed described in the next few passages.
Edge triggers
Positive TTL trigger
This mode is for detecting the rising edges of an external TTL si-
gnal. The board will trigger on the first rising edge that is detec-
ted 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.
gnal. The board will trigger on the first rising edge that is detec-
ted 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.
Example on how to set up the board for positive TTL trigger:
Negative TTL trigger
This mode is for detecting the falling edges of an external TTL si-
gnal. The board will trigger on the first falling edge that is detec-
ted 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.
gnal. The board will trigger on the first falling edge that is detec-
ted 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_TRIGGER50OHM
40110
r/w
Sets the 50 Ohm termination, if the trigger connector is used as an input for external trigger signals.
SpcSetParam (hDrv, SPC_TRIGGERMODE , TM_TTLPOS); // External positive TTL edge trigger
SpcSetParam (hDrv, SPC_TRIGGER50OHM, 1 ); // and the 50 Ohm termination of the trigger input are used
SpcSetParam (hDrv, SPC_TRIGGER50OHM, 1 ); // and the 50 Ohm termination of the trigger input are used
Register
Value
Direction
Description
SPC_TRIGGERMODE
40000
r/w
Sets the triggermode for the board
TM_TTLPOS
20000
Sets the trigger mode for external TTL trigger to detect positive edges
SpcSetParam (hDrv, SPC_TRIGGERMODE, TM_TTLPOS); // Setting up external TTL trigger to detect positive edges
Register
Value
Direction
Description
SPC_TRIGGERMODE
40000
r/w
Sets the triggermode for the board.
TM_TTLNEG
20010
Sets the trigger mode for external TTL trigger to detect negative edges.