C.6 MUX Scan Channel Control — BASE+02H

The write register at BASE+02H controls multiplexer (MUX) scanning. The high nibble provides the stop scan channel number, and the low nib- ble provides the start scan channel number. Writing to this register auto- matically initializes the MUX to the start channel. Each A/D conversion trigger sets the MUX to the next channel.

With continuous triggering the MUX will scan from the start channel to the end channel, then repeat. For example, if the start channel is 3 and the stop channel is 7, then the scan sequence is 3, 4, 5, 6, 7, 3, 4, 5, 6, 7, 3, 4.

Table C.7: Register for MUX Scan Channel Control

Write

MUX scan channel control

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bit #

7

6

5

4

3

 

2

1

0

 

 

 

 

 

 

 

 

 

 

BASE + 02H

CH3

CH2

CH1

CH0

CL3

 

CL2

CL1

CL0

 

 

 

 

 

 

 

 

 

 

CH3 ~ CH0

Stop scan channel number

 

 

 

CH0

The least significant bit (LSB) of the stop channel

CH3

The most significant bit (MSB)

 

 

 

CL3 ~ CL0

Start scan channel number

 

 

 

CL0

The least significant bit (LSB) of the start channel

CL3

The most significant bit (MSB)

 

 

 

The MUX scan register low nibble, CL3 to CL0, also acts as a pointer when you program the A/D input range (see previous section). When you set the MUX start channel to N, the range code written to the register BASE+01H is for channel N.

Programming example for PCI-1718HDU

This BASIC code fragment sets the range for channel 5 to ±0.625 V: 200 OUT BASE+2, 5 'SET POINTER TO CH.5

210 OUT BASE+1, 3 'RANGE CODE=3 FOR ±0.625 V

Note:

The MUX start/stop channel changes each time

 

you change the input range. Do not forget to reset

 

the MUX start and stop channels to the correct

 

values after you finish setting the range.

67

AppendixC

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Image 75
Advantech PCI-1718 Series user manual MUX Scan Channel Control BASE+02H, Table C.7 Register for MUX Scan Channel Control

PCI-1718 Series specifications

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