Operation Details - Canary MicroMux User Manual

Section 2 – MicroMux Operation and Installation

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.
NOTE: TIMING VALUES SHOWN ARE MINIMUM VALUES
50 mSec
ENABLE
CLOCK
NO CHANNEL
SELECTED
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
8 CHANNEL
1
O
RESERVED
2
N
8 CHANNEL
1
O
2 RESERVED
N
NOTE: Default Setting for MicroMux is 4 channel unless otherwise specified.
2 mSec
2 mSec
1
2
CHANNEL 2
CHANNEL 1
SELECTED
SELECTED
Mode
4 Channel (Default)
(All set to "OFF")
8 Channel
(SW1 set to "ON")
15
16
CHANNEL 15
CHANNEL 16
SELECTED
SELECTED
Description
Standard 4 channel mode for switching:
4-wire instruments (4 channel board)
8 channel mode for switching 2-wire
instruments
4
(DISABLED)
NO CHANNEL
SELECTED