Advantech Carbon Monoxide Alarm PCI-1718 Series Manuel D’Utilisation

DA11 ~ DA0 

Analog to digital data

DA0  

The least significant bit (LSB) of the D/A data

DA11 

The most significant bit (MSB)

When you write data to D/A channels, write the low byte first. The low 
byte is temporarily held by a register in the D/A and not released to the 
output. After you write the high byte, the low byte and high byte are 
added and passed to the D/A converter. This double buffering process 
protects the D/A data integrity through a single step update.

The PCi-1718 cards provide a precision fixed internal -5 V or -10 V refer-
ence, selectable by means of Jumper JP10. This reference voltage is 
available at connector CN3 pin 11. If you use this voltage as the D/A ref-
erence input, the D/A output range is either 0 to +5 V or 0 to +10 V. You 
can also use an external DC or AC source as the D/A reference input. In 
this case, the maximum reference input voltage is ±10 V, and the maxi-
mum D/A output ranges are 0 to +10 V or 0 to -10 V.

Connector CN3 supports all D/A signal connections. Chapter 3 gives con-
nector pin assignments and a wiring diagram for D/A signal connections.

FINT 

Enable/disable FIFO interrupt

0 FIFO 

interrupt 

disabled

1

FIFO interrupt enabled

Write

FIFO interrupt control

Bit  #

7

6

5

4

3

2

1

0

BASE + 06H

AD12_16

X

X

X

X

X

X

FINT