Konica Minolta PCI-1712L user manual Chapter

Chapter 5

the analog output operation. The minimum frequency is 156.2 S/s, the maximum frequency is 1 MS/s.

qExternal D/A Output Clock

The external D/A output clock is useful when you want to pace analog output operations at rates not available with the internal D/A output clock, or when you want to pace at uneven intervals, or when you want to start pacing on an external trigger event. Connect an external D/A output clock to screw terminal AO_CLK on the PCLD-8712 screw terminal board. Conversions will start on the rising edge of the external D/A output clock signal. You can use software to specify the clock source as external. Subsequently, the clock frequency that of the external D/A output clock input signal from the screw terminal board.

Trigger Sources

The PCI-1712 supports the following trigger sources for continuous output mode:

wSoftware trigger,

wExternal digital (TTL) trigger

With PCI-1712, user can define the type of trigger source as rising- edge or falling-edge.

The following section describes these trigger sources in more detail.

qSoftware Trigger

A software trigger event occurs when you start the analog output operation (the computer issues a write to the board to begin conver- sions). When you write the value to analog input trigger flag AO_TRGF on BASE+A to produce either a rising-edge or falling-edge trigger, depending upon the trigger source type you choose. This edge will then act as a D/A trigger event. For detailed information, please refer to Appendix D.7 A/D Control/Status Register.

qExternal Digital (TTL) Trigger

For analog output operations, an external digital trigger event occurs when the PCI-1712 detects either a rising or falling edge on the External D/A TTL trigger input signal from screw terminal AO_TRG on the PCLD-8712 screw terminal board. The trigger signal is TTL-compatible.

PCI-1712/1712L User’s Manual	– 42 –	Advantech Co., Ltd.
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