Measurement-computing CIO-DAS08/JR/16 Manual de usuario descargar pdf (Pagina 10)

6.4 DIGITAL I/O CONTROL REGISTER

BASE ADDRESS + 3

This address contains two registers, one for outputs and one for inputs. The output register is latched and holds the last value written

to it. The input register is not latched. Each time the register is read, the current state of the inputs is passed through this port into the

computer.

WRITE = Set digital output port, all bits.

READ = Read digital input port, all bits

, and

update both D/As simultaneously with last values written to D/A output registers.

D0D1D2D3D4D5D6D7

01234567

6.5 D/A CONTROL REGISTERS ( CIO-DAS08/JR/16-AO only)

Each D/A receives its data from a pair of 8-bit write-only registers. These registers contain the high byte and the low byte of the D/A

16-bit data word. The value written to these two registers determines the voltage output of the D/A chip. When in individual update

mode, the D/A outputs are updated when the high byte for the channel is written.

When in simultaneous mode, the D/A outputs are updated with the values in the D/A output registers when any register from BASE +0

to BASE + 7 is read.

The D/A output range can generally be calculated as [(#/65536) * 10V]

−

5V.

The #/65536 is a proportion of the Full Scale Range, which is +/-5V.

D/A 0 CONTROL REGISTERS

BASE ADDRESS + 4 DAC 0 LOW BYTE

DA0

LSB

DA1DA2DA3DA4DA5DA6DA7

01234567

BASE ADDRESS + 5 DAC 0 HIGH BYTE

DA8DA9DA10DA11DA12DA13DA14DA15

MSB

01234567

D/A 1 CONTROL REGISTERS

BASE ADDRESS + 6 DAC 1 LOW BYTE

DA0

LSB

DA1DA2DA3DA4DA5DA6DA7

01234567

BASE ADDRESS + 7 DAC 1 HIGH BYTE

DA8DA9DA10DA11DA12DA13DA14DA15

MSB

01234567

1 2 ... 5 6 7 8 9 10 11 12 13 14

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Measurement-computing CIO-DAS08/JR/16 Manual de usuario Pagina 10