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|  example of the mode 2 reply cod-
Pulse positon No.
Switch No.
Pulse group
ing setup.
1
1
A
2
Code number 5610
2
A
3
4
A
Pulses in reply code
Code
number
Code letter
4
1
B
5
Pulses Al and A4 (1 + 4 = 5)
A
5
2
B
6
Pulses B2 and B4 (2 + 4 =6)
6
B
4
B
7
Pulses Cl = 1
1
C
1
C
8
c
NO pulses = 0
0
D
2
9
c
4
10
1
D
D
11
2
D
12
4
c. Mode 2 code assignment is given by
Switches for setting up the mode 2 reply
a four-digit number. The digits represent
c o d e only are located on the receiver-
pulse group letters and the digit numeral
transmitter front panel. They are enclosed
represents the sum of the pulse position
by a small hinged door on the front cover,
numbers.
upper left side (fig. 7).
E x a m p l e : Code number 5610 would re-
a. The 12 mode 2 code switches are
quire switches No. 1, 3, 5, 6, and 7 to be
arranged in four horizontal rows with
at ON, with all others at OFF. The left-
t h r e e switches in each row. They are
hand digit of the code number being 5 calls
numbered from left to right and from top
for the A-group pukes in positions No. 1
to bottom, with numerals 1 through 12.
a n d 4, because only these two position
b. The four rows correspond to the four
numbers have. a sum total of 5. Switch No.
p u l s e g r o u p s (A, B, C, and D), and the
1 controls pulse A1; switch No. 3, pulse
three switches in each row correspond to
A4; switch No. 5, pulse B2; switch No. 6,
the pulse position numbers (1, 2, and 4)
pulse B4; and switch No. 7, pulse C1. No
within the pulse group. This explanation
D-group pulses are required in code 5610.
is simplified in the following chart:
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