Figure 4-1. Data link tester block diagram.

TM 11-6625-2937-13

SELECT switch and provides SHORT signal to SHORT

4-2.

Control-Interface Unit Functioning

indicator DS3 (1A2) if the dc voltages selected by the

a. Overall Block Diagram Analysis (fig. 4-2)

MODE SELECT switch for the encoder (5V and 12V)

(1) Power fault detection. The digital tester

or the decoder and STE (+5V and 15V) are not within

provides dc power (+5V +12V/+15V and -12V/-15V) to

the MODULE TEST connector (1A2) and the power

tolerance. The program card inserted in the card reader

supply monitor circuit (1A2A1) via MODE SELECT

slot of the digital tester establishes the correct MODE

switch S2 (1A2). The power supply monitor circuit, in

SELECT switch S2 (1A2) position for the appropriate

turn, monitors the power input from the MODE

MODULE TEST connector (1A2).

4-2