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
Advertising
Appendix B
Null Modem Cable Requirements
31
RS-449 Null Modem Cable
and
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
Advertising