Spectrum M2p.59 Series, Hardware Manual, Page: 112 / 190

112 (c) Spectrum Instrumentation GmbH
Channel Trigger Trigger modes and appendant registers
Channel Trigger
Overview of the channel trigger registers
The channel trigger modes are the most common modes, compared
to external equipment like oscilloscopes. The huge variety of different
channel trigger modes enable you to observe nearly any part of the
analog signal. This chapter is about to explain the different modes in
detail. To enable the channel trigger, you have to set the channel trig -
germode register accordingly. Therefore you have to choose, if you
either want only one channel to be the trigger source, or if you want
to combine two or more channels to a logical OR or a logical AND
trigger.
For all channel trigger modes, the OR mask must contain the corresponding input channels (channel 0 taken as example here):.
The following table shows the according registers for the two general channel trigger modes. It lists the maximum of the available channel
mode registers for your card’s series. So it can be that you have less channels installed on your specific card and therefore have less valid
channel mode registers. If you try to set a channel, that is not installed on your specific card, an error message will be returned.
Register Value Direction Description
SPC_TRIG_CH_ORMASK0 40460 read/write Defines the OR mask for the channel trigger sources.
SPC_TMASK0_CH0 1h Enables channel0 input for the channel OR mask
Table 69: Spectrum API: channel trigger register and available settings for these
Register Value Direction Description
SPC_TRIG_CH_AVAILMODES 40600 read Bitmask, in which all bits of the below mentioned modes for the channel trigger are set, if available.
SPC_TRIG_CH0_MODE 40610 read/write Sets the trigger mode for channel 0. Channel 0 must be enabled in the channel OR/AND mask.
SPC_TRIG_CH1_MODE 40611 read/write Sets the trigger mode for channel 1. Channel 1 must be enabled in the channel OR/AND mask.
SPC_TRIG_CH2_MODE 40612 read/write Sets the trigger mode for channel 2. Channel 2 must be enabled in the channel OR/AND mask.
SPC_TRIG_CH3_MODE 40613 read/write Sets the trigger mode for channel 3. Channel 3 must be enabled in the channel OR/AND mask.
SPC_TRIG_CH4_MODE 40614 read/write Sets the trigger mode for channel 4. Channel 4 must be enabled in the channel OR/AND mask.
SPC_TRIG_CH5_MODE 40615 read/write Sets the trigger mode for channel 5. Channel 5 must be enabled in the channel OR/AND mask.
SPC_TRIG_CH6_MODE 40616 read/write Sets the trigger mode for channel 6. Channel 6 must be enabled in the channel OR/AND mask.
SPC_TRIG_CH7_MODE 40617 read/write Sets the trigger mode for channel 7. Channel 7 must be enabled in the channel OR/AND mask.
SPC_TM_NONE 00000000h Channel is not used for trigger detection. This is as with the trigger masks another possibility for disabling channels.
SPC_TM_POS 00000001h Enables the trigger detection for positive edges
SPC_TM_NEG 00000002h Enables the trigger detection for negative edges
SPC_TM_BOTH 00000004h Enables the trigger detection for positive and negative edges
SPC_TM_LOW 00000010h Enables the trigger detection for LOW levels
SPC_TM_HIGH 00000008h Enables the trigger detection for HIGH levels
SPC_TM_POS | SPC_TM_REARM 01000001h Trigger detection for positive edges on level 0. Trigger is armed when crossing level 1 to avoid false trigger on noise
SPC_TM_NEG | SPC_TM_REARM 01000002h Trigger detection for negative edges on level 1. Trigger is armed when crossing level 0 to avoid false trigger on noise
SPC_TM_POS | SPC_TM_PW_GREATER 04000001h Enables the pulsewidth trigger detection for long positive pulses
SPC_TM_NEG | SPC_TM_PW_GREATER 04000002h Enables the pulsewidth trigger detection for long negative pulses
SPC_TM_POS | SPC_TM_PW_SMALLER 02000001h Enables the pulsewidth trigger detection for short positive pulses
SPC_TM_NEG | SPC_TM_PW_SMALLER 02000002h Enables the pulsewidth trigger detection for short negative pulses
SPC_TM_WINENTER 00000020h Enables the window trigger for entering signals
SPC_TM_WINLEAVE 00000040h Enables the window trigger for leaving signals
SPC_TM_INWIN 00000080h Enables the window trigger for inner signals
SPC_TM_OUTSIDEWIN 00000100h Enables the window trigger for outer signals
SPC_TM_POS | SPC_TM_HYSTERESIS 20000001h Enables the trigger detection for positive edges with hysteresis
SPC_TM_NEG | SPC_TM_HYSTERESIS 20000002h Enables the trigger detection for negative edges with hysteresis
SPC_TM_POS | SPC_TM_REARM |
SPC_TM_HYSTERESIS
21000001h Trigger detection for positive edges with hysteresis on level 0. Trigger is armed when crossing level 1 to avoid false
trigger on noise
SPC_TM_NEG | SPC_TM_REARM |
SPC_TM_HYSTERESIS
21000002h Trigger detection for negative edges with hysteresis on level 1. Trigger is armed when crossing level 0 to avoid false
trigger on noise
SPC_TM_LOW | SPC_TM_HYSTERESIS 20000010h Enables the trigger detection for LOW levels with hysteresis
SPC_TM_HIGH | SPC_TM_HYSTERESIS 20000008h Enables the trigger detection for HIGH levels with hysteresis
Image 63: trigger engine overview and channel trigger