Campbell AVW1 Especificaciones descargar pdf (Pagina 12)

AM16/32B Relay Analog Multiplexer

RES

CLK

GND

12V

MUXPOWER

SHIELD

CR800,

CR850

CR10X,

CR3000,

CR1000

CR23X,

CR5000

21X

CR7

G G

12 V 12 V 12 V +12 V 12 V

G G G

C1-C4 C1-C8 C1-C8 EXCIT 1-4 EXCITATION

C1-C4 C1-C8 C1-C8 C1-C8 725 Card

Control

CABLE

FIGURE 3. AM16/32B to Datalogger Power/Control Hookup using CABLE4CBL or MUXPOWER Cable

With the 21X or CR7 the AM16/32B connects to the 12 VDC and “

”

terminals for power. One control port is used for reset, and one switched

excitation channel is used for clock (on 725 card with CR7). If a switched

excitation port is not available, an additional control port can be used to

provide clock pulses to the multiplexer.

4.1.1 Reset

The reset (“RES”) line is used to activate the AM16/32B. A signal in the

range of +3.3 to +8 VDC applied to the reset terminal activates the multiplexer.

When this line drops lower than +0.9 VDC, the multiplexer enters a quiescent,

low-current-drain state. In the quiescent state the common (“COM”) terminals

are electrically disconnected from all of the sensor input channels. Reset

should always connect to a datalogger control port. The CR800, CR850,

CR3000, CR5000, and CR1000 use the PortSet instruction to control the reset

line. Instruction 86 (option code 41 - 48 to activate, and 51 - 58 to deactivate)

is generally used to activate/deactivate the multiplexer when using an Edlog

datalogger; however, in the case of the 21X or CR7 with older PROMS,

Instruction 20 is commonly used.

4.1.2 Clock

Pulsing the AM16/32B “CLK” line high (‘RES” line already high) advances

the channel. The voltage level must fall below 1.5 VDC and then rise above

3.3 VDC to clock the multiplexer.

The AM16/32B operates in one of two clocking modes:

Mode A—sequentially advances through each relay channel (as long as

RESET is HI, relays are closed on each rising CLK edge). A more detailed

description of Mode A is provided in section 4.1.2.1.

Mode B—uses a relay address to go directly to a specific channel (see Figure

4). This reduces power consumption and wear on the relay switches. When

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Campbell AVW1 Especificaciones Pagina 12

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