Rc Code Diagram - Watkins-Johnson Company WJ-8718A/MFP Instruction Supplement

FIGURE 4-1 WJ-8718A/MFP
4.1.1.1.2 Switch Codes (RC)
The front panel is organized into two switch matrixes, as described in
paragraph 3.1.2.2. The Group 1 switches are on the right side of the front panel, and the
Group 2 switches are on the left. Figure 6-4 is the schematic diagram illustrating both switcJ'l
matrixes.
The X and Y planes of each switch matrix are identified as rows
(y)
and columns
(X). Each switch can be identified by the unique position it occupies in a row and a column.
Figure 4-1 illustrates a 2 by 2 switch matrix. The RC code is derived from the row and column
position as shown in the Figure 4-1 table. S1 is in Row 0, Column 0 and is coded 00; 82 is in
Row 0, Column 1 and is coded 01;
83
is in Row 1, Column 0 and is coded 10;
84
is in Row 1,
Column 1 and is coded 11. This same principle is used for coding the 4 by 5 Group 1 matrix and
the 8 by 8 Group 2 matrix.
The BITE program can be used during troubleshooting to isolate switch problems to
a single switch, a row, a column, or a group. Refer to paragraph 4.1.5 for a discussion of switch
troubleshooting.
53
--L
r - - - - O
C)
~CO
~CI
RO RI
R
=
ROW
C
=
COLUMN
RO
51
...L
C>-
_---+----4---
CO
54
--L
"'--0
C)
52
...L
o - - - + - - -.....
- - C I
RI
4-4
Figure 4-1. RC Code Diagram