Sun-microsystems Sun PCI High Speed Quad Port Serial Interface Adap Manual de usuario descargar pdf (Pagina 51)

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

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 63 64

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Sun-microsystems Sun PCI High Speed Quad Port Serial Interface Adap Manual de usuario Pagina 51