The Serial Connection
Appendix C
GPIB-232CT User Manual
C-2
© National Instruments Corp.
Table C-1. RS-232 Serial Port Pinouts
!
RS-232
Name
Pin
Signal Name
Function
!
!
AA
1
PG
This line is connected to the chassis
(Protective
ground of the GPIB-232CT.
Ground)
!
!
BA
2
TxD
This line carries serial data from the
(Transmit Data)
GPIB-232CT to the serial host.
!
!
BB
3
RxD
This line carries serial data from the
(Receive Data)
serial host to the GPIB-232CT.
!
!
CA
4
RTS
This signal line is asserted by the
(Request to
GPIB-232CT when it is ready to
Send)
accept serial data over the RS-232.
RTS is unasserted when the
GPIB-232CT is no longer ready to
accept serial data.
!
!
CB
5
CTS
This signal line is asserted by the
(Clear to Send)
serial host and sensed by the
GPIB-232CT. It indicates that the
serial host is ready to accept data.
When CTS is unasserted, data
transmission from the GPIB-232CT
is
disabled.
!
!
AB
7
SG
This line establishes a reference
(Signal Ground) point for all interface voltages.
!
!
CD
20
DTR
This signal line is asserted by the
(Data Terminal
GPIB-232CT when it is powered on.
Ready
It can be used to notify the other
serial device that the GPIB-232CT
has been powered on, or it could be
used
to
wrap back
to the
GPIB-232CT CTS input if no
hardware handshake is used.
!
