Campbell AVW200 series Manuál s instrukcemi stáhnout pdf (Strana 36)

Relay

Control

Microcontroller

12V

GROUND

RESET

CLOCK

COM HI

COM LO

CR800/CR1000

Sensor #1

Sensor #32

12V

GROUND

RESET

CLOCK

Multiplexer/Terminal Board

Sensor

Shield

Sensor

Shield

32H

32L

S16

Figure 2 - 32 Channel Switching Block Diagram

The 32 channel 2 wire switching configuration is typically used to multiplex 2 wire

sensors such as a vibrating wire pressure transducers, thermistors or thermocouples.

The multiplexer is powered by a nominal 12 VDC supply. Two control lines (RESET

and CLOCK) determine how channel selection is accomplished. Two schemes are

supported - one when connected to the GK-403 Vibrating Wire Readout Box and the

other when connected to MICRO-800 or MICRO-1000 dataloggers. See the following

sections explaining how each mode operates.

Figure 3 illustrates the DIP switch SW1 position 1 for switching between 16 and 32

channel operation. SW1 switch 1 ON = 32 channel, OFF = 16 channel. In Figure 3, 32

channel mode is chosen:

Figure 3 - 16 or 32 Channel Selection

OFF

SW1

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 46 47

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Campbell AVW200 series Manuál s instrukcemi Strana 36