Omega Engineering DAQ-12 user manual INT2 INT1 INT0 Description

INT2, INT1 and INT0 control the DAQ-12 interrupt source.

INT2	INT1	INT0	DESCRIPTION
0	0	0	Interrupt disabled
1	0	0	Interrupt timer 2
1	0	1	Interrupt on terminal count
1	1	0	External interrupt
1	1	1	Interrupt on end of conversion

DMAEN - enables / disables DMA. When set, logic 1, DMA transfers are enabled.

DMACT - enables the multi-channel DMA capability of the DAQ-12. When set, logic 1, a terminal count on the active DMA channel causes DMA transfers to begin on the "stand-by" channel. When cleared, logic 0, DMA transfers halt when the terminal count is reached on the active channel.

DMACH - indicates which of the DAQ-12'S DMA channels is currently active to transfer data. Logic 0 indicates DMA channel 0, logic 1 indicates DMA channel 1.

DMASL - When using differential input mode, eight input channels are available (CH0+ through CH7+). When using single-ended inputs, 16 channels are available (CH0+ through CH15+). The first eight channels are input through the connections marked CH0+ through CH7+ and the second eight channels through CH0- through CH7-.

LEVEL - selects the edge of the external trigger input. When set, logic 1, A/D conversions will begin on the falling edge of the external trigger input. When cleared, logic 0, conversions will begin on the rising edge of the external trigger. IMPORTANT: LEVEL must be logic 0 when internal triggering is used.

TRIG - selects between internal and external triggers. When set, logic 1, the external trigger is selected.

CLK - selects between internal and external clock sources. When set, logic 1, the external clock source is selected.

RUN - when set, logic 1, the A/D converter is placed in the 'run' mode and will begin converting data when a trigger is received. RUN may be cleared at any time by writing a "0" to it. When using DMA transfers, RUN is automatically cleared when a terminal count is received with DMACT set to "0".

EOC - when set, indicates an end of conversion has taken place and the data is available in the A/D converter data register.

DAQ-12 Users Manual 26