Measurement-computing CIO-DAS08-PGH User Manual download pdf (Page 19)

MUX 2 to MUX 0 is the current multiplexer channel. The current channel is a binary coded number between 0 and 7 .

WRITE = CONTROL

BASE + 2 (Read / Write) Write Functions

MUX0MUX1MUX2INTEOP1OP2OP3OP4

01234567

OP4 to OP1 are the digital output lines on the 37 pin analog connector.

INTE = 1 enables interrupts (positive edge triggered) onto the PC bus IRQ selected via the IRQ jumper on the CIO-DAS08-PGA.

INTE = 0 disables the passing of the interrupt detected at pin 24 to the PC bus.

IRQ is set to 1 every time an interrupt occurs. If you want to process successive interrupts then set INTE = 1 as the last step in

your interrupt service routine.

MUX2 to MUX0. Set the current channel address by writing a binary coded number between 0 and 7 to these three bits.

NOTE

Every write to this register sets the current A/D channel MUX setting to the number in bits 2-0.

4.4 PROGRAMMABLE GAIN REGISTER

The register's layout when written to is :

BASE + 3 (Read / Write) Write Functions

R0R1R2R3XXXX

BIT 0BIT 1BIT 2BIT 3BIT 4BIT 5BIT 6BIT 7

The register's layout when read from is :

BASE + 3 (Read / Write) Read Functions

R0R1R2R3MA0MA1MA2X

BIT 0 BIT 1BIT 2BIT 3BIT 4BIT 5BIT 6BIT 7

The gain/range of a board is controlled by writing a control code to the register. The codes are as follows:

011066+

0.0051000

0111E14+

0.01500

001044+

0.05100

0011C12+

0.150

010022+

0.510

0101A10+

1.05

000000+

5.01

000188+

10.00.5

R0R1R2R3HEXDECRANGE VGAIN

CONTROL CODESBI-POLAR

CIO-DAS08-PGH

1110770 to 0.011,000

1010550 to 0.1100

1100330 to 1.010

1000110 to 10.01

R0R1R2R3HEXDECRANGE VGAIN

CONTROL CODESUNI-POLAR

CIO-DAS08-PGH

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 27 28

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Measurement-computing CIO-DAS08-PGH User Manual Page 19

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