Chapter 4 FUNCTIONING OF EQUIPMENT - TM-5-6350-262-14-120014

CHAPTER 4

FUNCTIONING OF EQUIPMENT

decoded in the receiver. After the receiver decodes the

4-1. General

status present at the control unit it provides this status to

This chapter contains the description of the operation of

the Status Indicator of the Monitor Unit which then sets

the data transmission system type I (DTS-I). The DTS-I

appropriate alarm or status conditions. Paragraph 1-8

provides a secure method of transmitting the status at

gives the detailed purpose and use of the DTS-I and

the control unit of the J-SIID system to the monitor unit of

paragraph 1-9 gives its physical description. Figure 4-1

the system. The Status is transmitted by means of a

is a block diagram showing the relationship of the DTS-I

continual stream of encoded data words which are

to the overall J-SIID system, for reference.

generated in the transmitter of the system and which are

NOTE: DTS-I IS BOLDLY OUTLINED .

ME 6350-262-14/12/4-1

Figure 4-1. Overall block diagram, DTS-I and related components.

presented to the receiver of the system, by means of the

4-2. Functional Description

transmission line, as a serial stream of 12-bit words

a. Data Transmitter. Table 2-1 lists the inputs

b. Data Receiver. The data receiver receives

to the data transmitter. Four of the inputs (Instantaneous

the 12-bit word stream from the transmitter by means of

ALARM/NO ALARM, latched ALARM/NO ALARM,

the 600 ohm transmission line and from these words

ACCESS/SECURE, and AC POWER ON/AC POWER

decodes the current status at the status processor for

FAIL) are status inputs from the status processor. These

presentation to the associated status indicator in the

inputs represent the current status at the control unit.

monitor unit. Table 4-1 lists the pin connections at the

Paragraph 1-11 lists the impedance conditions at the

I/O (input/output) connector to the associated status

input to the receiver which correspond to the current

indicator and the function of each pin connection. Table

status conditions at the input to the status processor.

4-2 lists the conditions at the output of the receiver which

The other four inputs to the receiver are power and return

result depending on the status decoded by the receiver

inputs, and the resync initiation input. The status inputs

logic.

to the transmitter are encoded using a random bit

generator and modulo-2 adder logic (exclusive or), and

4-1