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APPENDIX D – DAISYCHAIN OPERATION
Up to (8) 8032's may be "daisychained" together using a common RESET and CLOCK control
line. This may be advantageous in situations where either there are not enough control ports
available on the Micro-800/MICRO-1000 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
4-conductor channels may be accessed per RESET line.
SW1 Setting
2
3
OFF
OFF
OFF
OFF
OFF
ON
OFF
ON
ON
OFF
ON
OFF
ON
ON
ON
ON
The following example on the next page is a schematic representations of the daisychain
configuration with multiplexers configured for 32 channels. The figure D-1 shows 3 multiplexers
sharing the same control ports, and a single cable is used to interconnect them.
4
OFF
1-32 (32 channel mode) , 1-16 (16 channel mode) DEFAULT MUX1
ON
33-64 (32 channel mode) , 17-32 (16 channel mode) MUX2
OFF
65-96 (32 channel mode) , 33-48 (16 channel mode) MUX3
ON
97-128 (32 channel mode) , 49-64 (16 channel mode) MUX4
OFF
129-160 (32 channel mode) , 65-80 (16 channel mode) MUX5
ON
161-192 (32 channel mode) , 81-96 (16 channel mode) MUX6
OFF
193-224 (32 channel mode) , 97-112 (16 channel mode) MUX7
ON
225-256 (32 channel mode) , 113-128 (16 channel mode) MUX8
Table D.1 – Daisychain Operation/Channels Accessed
Channels Accessed
17
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