Advantech PCI-1720 Manual de usuario descargar pdf (Pagina 25)

Chapter 4 Register Structure and Format 21

4.2.3 Synchronized Output Prompt Register

During normal operation, the PCI-1720 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-1720 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

synchronizing character. Any character can act as a synchronizing

character, but it must be written to the BASE + 9 register to prompt

synchronized output.

4.2.4 Synchronized Output Control Bit

Table 4-5: Synchronized output control bit

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 output channel receives an element of output

data.

Base

Address

+ decimal

Data

Function description R/W

76543210

+15 SC0

Synchronized output

control bit

R/W

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 35 36

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Advantech PCI-1720 Manual de usuario Pagina 25