Daisy Chain Operation - Geokon 8025 Instruction Manual

F.8 DAISY CHAIN OPERATION
Up to 8032's may be "daisy chained" 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 multichannel 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 two conductor channels or
128 four 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 example on the next page is a schematic representations of the daisy chain configuration
with multiplexers configured for 32 channels. This example shows three 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
Daisy chain Operation/Channels Accessed
Channels Accessed
37