CHAPTER 2 TECHNICAL PRINCIPLES OF OPERATION

TM 11-7010-207-23

CHAPTER

TECHNICAL

PRINCIPLES

OPERATION

This chapter explains how the 600GR converter operates and how it interfaces with

various transmission lines to send and receive data.

2-2. FUNCTIONAL DESCRIPTION

Two converters of the same type are required for data transmission between two data

terminals. The two terminals can be central processors, or a central processor and

a remote terminal. The communications link between the two converters must be

dedicated metallic circuits or direct connected phone lines. Interface connections

to DTE and DCE are povided bv the line and terminal connectors on the rear panel

of each unit. Figure 2-1 illustrates the interface cabling. The interface `is

compatible with RS-232-C and MIL-188-114 low level input/output interface and

interface exchange requirements. Table 2-1 lists and describes each interface

signal.

4 WIRE/FULL OR HALF DUPLEX

DTE, DCE Interface

The transmit portion of each converter begins carrier transmission when Request to

Send (RTS) turns on. Transmit data from the terminal or data communications

equipment is inhibited in a mark state until the converter has timed out the Clear

to Send (CTS) delay. After CTS turns on, the terminal may begin transmitting the

normal rate. When a converter is operating in a full-duplex mode, the transmitter

is controlled by RTS and the received data is controlled by Received Line Signal

Detector (RLSD). When transmitting in half-duplex mode, the transmitter and

receiver are controlled by logical combinations of RTS and RLSD. While

transmitting, receive data to the terminal is inhibited. If there is an attempt to

transmit and receive simultaneously, the first function to occur will inhibit the

other.

2-1