Measurement-computing PCM-DAS08 Manuale Utente Scaricare il pdf (Pagina 13)

Read Status

MA0MA1MA2XDIn0DIn1DIn 2

Ex Trig

EOC

01234567

EOC is the end of conversion flag from the A/D converter. A one means the A/D is

busy with a conversion. A zero indicates that the conversion is complete and the data

from the most recently triggered A/D conversion may be read from base + 0 and 1.

DIn 2 / Ex Trig is always one when an external trigger source has been selected via

the TRG bits in Base + 3. Otherwise the status of the TTL input on pin 13 may be

read from this bit. See Base + 3.

Digital Input 0 and 1 are the PCM-DAS08 15 pin connector digital inputs. The

inputs are not latched. Each read gives the current status of the input lines. A zero

equals TTL low and a one equals TTL high.

MA2 to MA0 are the current A/D channel addresses.

BASE + 3 - Trigger Source & Pacer Rate

Write control - No read back. No read function

TRG 0TRG 1TRG 2INT ENAXXXX

01234567

INT ENA: Interrupt Enable. Interrupts are enabled when this bit is set to one and

disabled when set to zero.

Table 5-1. Pacing Source and Rate Coding

RG 2 TRG 1 TRG 0 A/D Trigger Source and Rate

0 X 0 Software trigger by writing to base address.

0 X 1 External falling-edge trigger on pin 13

1 0 0 Internally triggered and paced at 3.125 kHz

1 0 1 Internally triggered and paced at 6.25 kHz

1 1 0 Internally triggered and paced at 12.5 kHz

1 1 1 Internally triggered and paced at 25 kHz

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 19 20

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Measurement-computing PCM-DAS08 Manuale Utente Pagina 13