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3
Introduction to the Plug-In Modules for the 34980A
Slot and Channel Addressing Scheme
The eight module slots in the 34980A are arranged as shown below.
The slot and channel addressing scheme for the 34980A follows the form sccc
where s is the mainframe slot number (1 through 8) and ccc is the three- digit
channel number. Note that MUX channels numbers are derived differently
from matrix modules, and channel numbers for matrix modules are derived
differently between 1- wire and 2- wire configuration modes.
Displayed Number...
1014
3921
5304
2437
90
Slot number designations
Means This...
A MUX module is in slot 1, channel
of interest is 14. This channel is
labeled on the simplified
schematics as 014 on Bank 1 of
each MUX module.
A MUX or matrix module is in slot
3, channel of interest is 921
(Analog Bus relay on ABus1)
A 34931A, 34932A, 34933A (2-wire
mode) matrix module is in slot 5,
crosspoint is row 3, column 4.
A 34933A matrix module in 1-wire
mode is in slot 2, matrix of interest
is 4, crosspoint is row 3, column 7.
Determined by...
MUX module channel numbers are
determined by the numbers assigned
to the switches on each bank. Channel
numbers contain three digits.
MUX and matrix channel numbers for
the Analog Bus relays are determined
by the number assigned to the relays.
Matrix module (in 2-wire mode)
channel numbers are derived from the
crosspoint or intersection of rows and
columns, columns having two digits).
34933A matrix module (in 1-wire
mode) channel numbers are derived
from a specific matrix number and the
crosspoint or intersection of rows and
columns on that matrix.
34980A User's Guide
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