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APPENDIX D. "DAISY-CHAIN" OPERATION
Up to eight 8032's can be "daisy-chained" together using a common RESET and CLOCK
control line. This can be advantageous in situations where either there are not enough control
ports available on the datalogger for the number of multiplexers desired, or to reduce the number
of cables required to implement a large multi-channel system.
SW1 located on the Terminal Block side of the circuit board determines the address of each
multiplexer and the corresponding signal channels. As many as 256 2-conductor channels or 128
four-conductor channels can be accessed per RESET line.
SW1 Setting
2
3
4
OFF
OFF
OFF
OFF
OFF
ON
OFF
ON
OFF
OFF
ON
ON
ON
OFF
OFF
ON
OFF
ON
ON
ON
OFF
ON
ON
ON
Figure 13 is a schematic representation of the "daisy-chain" configuration with multiplexers
configured for 32-channels. Figure 13 shows three multiplexers sharing the same control ports,
and a single cable is used to interconnect them.
VW Gauges 1-32
VW Gauges 33-64
VW Gauges 65-96
1-32 (32-channel mode),1-16 (16-channel mode) DEFAULT MUX1
33-64 (32-channel mode), 17-32 (16-channel mode) MUX2
65-96 (32-channel mode), 33-48 (16-channel mode) MUX3
97-128 (32-channel mode), 49-64 (16-channel mode) MUX4
129-160 (32-channel mode), 65-80 (16-channel mode) MUX5
161-192 (32-channel mode), 81-96 (16-channel mode) MUX6
193-224 (32-channel mode), 97-112 (16-channel mode) MUX7
225-256 (32-channel mode), 113-128 (16-channel mode) MUX8
Table 9 - "Daisy-Chain" Operation/Channels Accessed
Datalogger
C7
Reset
Reset
IN
H
H
OUT
Reset
IN
H
H
OUT
Reset
IN
H
Figure 13 - "Daisy-chain" Configuration
Channels Accessed
C8
Clock
Multiplexer #1
Clock
MUX1
J
SW1 SETTING:
2 3 4
OFF OFF OFF
J
Multiplexer #2
Clock
MUX2
J
SW1 SETTING:
2 3 4
OFF OFF ON
J
Multiplexer #3
Clock
J
SW1 SETTING:
2 3 4
OFF ON OFF
MUX3
17
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