User's Manual Part 2

CAS / Part No. 9000000

SYSTEM DESCRIPTION AND INSTALLATION MANUAL

34-43-20

15 Feb 2003

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3--35

Figure 3--12. Strap Assembly

Table 3--6. Strap Assembly Programming Instructions

Strap

Number

Functional Description

SYSTEM (SIDE) POSITION: (B0, B1)

The System (Side) Position straps define which system position the transponder is

located at. Normal practice is to designate the captain’s or pilot’s system as Side 1, the

copilot’s system as Side 2, and the engineer’ s, center, or backup system as Side 3. The

straps are defined as follows:

Strap Number

W1 W2 Definition

Gnd Gnd Side 1

Open Gnd Side 2

Gnd Open Side 3

Open Open Reserved

PARITY

The Parity straps are used to make sure the strap data is valid. Straps W3 and W4 are

parity bits and must be programmed as follows:

After all other straps have been programmed, count the number of Gnd (Uncut) straps in

positions W1, W2 and W5 thru W48. If the number of uncut straps is even, cut strap W3.

If the number of uncut straps is odd, cut strap W4.

NOTES:

1. To have correct parity, either jumper W3 or W4 has to be cut, but not both.

2. If parity is invalid, the transponder fails the Power--On Self--Test (POST) and

discontinues operation.