Section III. FINAL INSTALLATION PROCEDURE

TM 11-5815-206-12/ TO 31W4-2PGC1-61

Section III. FINAL INSTALLATION PROCEDURE

2-9. Installation Options

portion of the teletypewriter. REC terminals 3 and

4 are associated with the page printer portion.

a. Installation for Half-Duplex Operation Not

BATTERY terminals 5 and 6 are used for con-

Applicable to TT-698(*)/FG, (para 2-11 and 2-12).

nection of dc power for the signal circuit. The

When installed for half-duplex operation, a

proper connections vary in accordance with the

teletypewriter is connected to one or more other

operational requirements of the individual station,

teletypewriters and all can send messages to and

as described in paragraphs 2-9, and 2-11 through

receive

messages from each other (not

2-15). Before making any connections to the line

simultaneously). The transmitted messages are

terminal board, proceed as follows:

printed at all teletypewriters, including the sending

(1) Turn the LINE INCREASE knob (fig. 3-

teletypewriter.

1) fully counterclockwise.

b. Installation for Receive-Only Operation (para

(2) Set the LINE switch of the TT-4(*)/TG

2-13). When installed for receive-only operation,

and TT-335/TG (fig. 1-7) to Dc line for 60-ma

the teletypewriter can receive messages from other

signal circuit operation (operation in a dc system)

stations only. Messages cannot be sent from a

(fig. 1-3) or to VOICE FREQ LINE for 20-ma

teletypewriter installed for receive-only operation.

signal circuit operation (operation in a voice-

c. Installation for Full-Duplex Operation (para

frequency system). The LINE switch of the TT-

2-15). When a teletypewriter is installed for full-

537/G is equipped with a lock which holds the

duplex operation, messages can be sent from the

switch in the VOICE FREQ LINE position. Do

teletypewriter but a copy of the transmitted

not change the position of this switch.

messages i s n o t p r i n t e d b y t h e s e n d i n g

(3) Check to be sure the teletypewriter is

teletypewriter. The page printer portion of the

grounded properly (para 2-7).

teletypewriter is used only to print messages

NOTE

received from other transmitting stations.

Send terminal 0 is used for an unusual

d. Installation for FADAC Operation (TT-537

application of the TT-4(*)/TG which is not

/G ). When Teletypewriter TT-537/G is install-

covered in this manual. Installation for this

ed in a FADAC system (para 2-14), it receives

application is performed by higher category

messages from the computer. The keyboard-

maintenance personnel. P o w e r cable

transmitter is not normally used with this system.

Assembly CX-1202/U (fig. 1-5) is not

2-10. Signal Line and Dc Power Connections,

supplied as part of the TT-4(*)/TG. If only

General

the TT-4(*)/TG is furnished, and a local

a. High Level Units Connections. Terminals 0

source of dc signal circuit power is to be

through 6 on the line terminal board (fig. 1-9 and

used, obtain a length of two-conductor

2-6) are provided for the connection of the signal

rubber-covered cable and make a suitable

lines and a dc power cord. SEND terminals 0, 1,

substitute for the CX-1202/U.

and 2 are associated with the keyboard transmitter

2-7