Canary MicroMux User Manual - page 4
Section 2 – MicroMux Operation and Installation
4
2.1 Operation Details
The MicroMux is controlled by the Datalogger Controller using 2 digital control signals. The operation of
the MicroMux is simple enough so that virtually any device capable of controlling 2 digital TTL/CMOS type
signals can be used to control the multiplexer. Generally speaking, the timing diagram depicted below
describes how the 2 digital signals are used to control the MicroMux.
In the case of the 4 or 8 channel modes, the maximum number of pulses to advance through all the
channels would be 4 and 8, respectively.
The channel switching mode is selected by configuring the DIP switch mounted on the MultiMux board.
The table shown below describes the 2 possible configurations.
DIP Settings
Mode
Description
4 Channel (Default)
(All set to “OFF”)
Standard 4 channel mode for switching:
4-wire instruments (4 channel board)
8 Channel
(SW1 set to “ON”)
8 channel mode for switching 2-wire
instruments
NOTE: Default Setting for MicroMux is 4 channel unless otherwise specified.
8 CHANNEL
O
N
2
1
RESERVED
8 CHANNEL
O
N
2
1
RESERVED
CLOCK
ENABLE
NO CHANNEL
SELECTED
CHANNEL 1
SELECTED
1
CHANNEL 2
SELECTED
2
15
16
CHANNEL 15
SELECTED
CHANNEL 16
SELECTED
NOTE: TIMING VALUES SHOWN ARE MINIMUM VALUES
50 mSec
2 mSec
2 mSec
(DISABLED)
NO CHANNEL
SELECTED