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1.2 Modes of Operation
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 when connected to Model 8600 dataloggers, and the other for the GK-403
Vibrating Wire Readout Box (obsolete model). See the following sections explaining how each
mode operates.
Figure 4 illustrates the DIP switch SW2 for switching between a GK-403 or Datalogger
application. "DATALOGGER" is the default SW2 position:
1.2.1 Datalogger Mode of Operation
The Datalogger mode of operation uses two control lines to operate the multiplexer. The
RESET line enables the multiplexer and activates the Datalogger mode of clocking.
Pulses received on the CLOCK line sequentially increment the channels while the RESET
line is held high. See the timing diagrams below (Figure 5 and Figure 6)
The CLOCK line sequentially advances the channels beginning with Channel 1. Note the
timing diagrams for 16-channel (shown in Figure 5) and 32-channel (shown in Figure 6)
channel switching arrangements.
T1
T2
T3
Reset
Clock
Pulse 1
No Channel
Selected
Timing:
T1 = 50 mSec(min.)
T2 = 2 mSsec(min)
T3 = 4 mSsec(min)
GK-403
DATALOGGER
Figure 4 - GK-403/DATALOGGER Selection
Pulse 2
Channel 1
Selected
Figure 5 - 16-Channel Datalogger Channel Selection Timing
SW2
Pulse 31
Pulse 32
Channel 16
Selected
3
No Channel
Selected
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