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Rs-449 null modem cable, Table b-1, Table b-2 – Sun Microsystems Sun PCI High Speed Quad Port Serial Interface Adapter 819-1207-11 User Manual

Page 51

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Appendix B

Null Modem Cable Requirements

31

RS-449 Null Modem Cable

TABLE B-1

and

TABLE B-2

list the signals and names for RS-499 and X.21 circuits

TABLE B-1

RS-449 Signals

Circuit

Name

Direction

TxD

Transmit Data

To DCE

RxD

Receive Data

From DCE

TxC

Transmit Clock

To DCE

TxCI

Transmit Clock In

From DCE

RxC

Receive Clock

From DCE

RTS

Request to Send

To DCE

CTS

Clear to Send

From DCE

DCD

Data Carrier Detect

From DCE

DTR

Data Terminal Ready

To DCE

DSR

Data Set Ready

From DCE

SG

Signal Ground

TABLE B-2

X.21 Signals

Circuit

Name

Direction

G

Signal Ground

T

Transmit

To DCE

R

Receive

From DCE

C

Control

To DCE

I

Indication

From DCE

S

Signal Element Timing

From DCE

B

Byte Timing

From DCE

See also other documents in the category Sun Microsystems Hardware: