NEC nd-20292 manual RS-232C Male Connector

ND-20292

CHAPTER 2

APRIL, 1990

RS-232C MALE

CONNECTOR

7 SG .

2 TXD .

		3	Rx5	*-:
		4	RTS	l
		5	CTS	.
TO MODEM	Q	6	DSR	.
		8	DCD	.
		20	DTR	.
		11	PB	.

NOTE 1: Switch settings on DTA-E Unit are as follows:

SW l-2 (RS) . . . . . . . ON SW 3-3& 8 . . . . . . . . . . . ON All other Pins . . . . . . . . OFF

	RS-232C	MALE
	CONNECTOR
.	7	SC
		TXD
		RXD
.	4	RTS
.	5	CTS	TO DTA-E
l	6	DSR	UNIT
.	8	DCD
-	20	DTR

NOTE 2: If pin 8 (CD) from the modem is high, MBlD2, LK3 must be OFF.

Figure 200-55 Wiring Connections of RS-232C Null Modem Cable for Connecting a Modem to a DTA-E (Rev. 2 or higher) Unit.

EIA

SIGNAL

SIGNAL

PIN NO.

DESIGNATION

DESIGNATION

1

L

TELEPHONE

LINE

LAMP

CONTROL

2

MB1

MAKE

BUSY

RELAY

CONTACTS

IN MODEM

3

MB

MAKE

BUSY

RELAY

CONTACTS

IN MODEM

4

LG

GROUND

RETURN

FOR

LAMP

CIRCUIT

5

TD

TALK/DATA

SWITCH

CONTACTS

IN

TELEPHONE

(WITH

TDG)

(POWER

RELAY

CONTACT)

7

T

TELEPHONE

LINE

TIP

Is

R

TFl

FPHONF

LINF

RING

12

RD

RING

DETECT

CONTACTS

(TO

GROUND)

IN

MODEM

14

C

DATA

MODE

CONTACTS

(TO

GROUND)

IN

MODEM

16

Dl

DATA

MODE

CONTACTS

(TO

GROUND)

FROM

ACU

21

Tl

TELEPHONE

SET

TIP

22

RI

TELEPHONE

SET

RING

A

CONTACTCLOSURE

INDICATING

THAT

MODEM

ORTELEPHONE

IS HOLDING

THE

LINE

24

Al

CONTACTCLOSURE

INDICATING

THAT

MODEM

ORTELEPHONE

IS HOLDING

THE

LINE

r-

TDG

GROUND

RETURN

FOR

TD SWITCH

(SEE

PIN

5)

(POWER

RELAY

CONTACT)

&

25

I

Figure 200-56 Data Set Modem (Non Hayes Compatible Modem) Telephone or ACU Interface

200 - 46