Advantech PCI-1720U Manual de usuario descargar pdf (Pagina 27)

21 Chapter 4

4.2.3 Synchronized Output Prompt Register

During normal operation, the PCI-1720U will accept digital values one at

a time from the host PC, convert these values to analog values, and

immediately output these analog values from the channels directed by the

host PC.

However, the PCI-1720U has the capability to store each analog value in

its proper channel buffer as it is generated, then simultaneously output

one analog value from each of its four channels on receipt of a synchro-

nizing character. Any character can act as a synchronizing character, but

it must be written to the BASE + 9 register to prompt synchronized out-

put.

4.2.4 Synchronized Output Control Bitt

The register BASE + 15 stores the synchronized output control bit. When

the SC0 bit is set to 1, the synchronized data output function is enabled

and analog values will not be output until a character is written to the

BASE + 9 register. When the SC0 bit is set to 0, the synchronized data

output function is disabled. Analog data output occurs as soon as an out-

put channel receives an element of output data.

Table 4.5: Synchronized Output Control Bit

Base

Address

+ decimal

Data Function Descrip-

tion

R/W

76543210

+15 SC0 Synchronized

output control bit

R/W

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 37 38

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Advantech PCI-1720U Manual de usuario Pagina 27