Table B-1. Rs-232 Serial Port Signal Configuration - National Instruments GPIB-232CV-A User Manual

Appendix B Interfacing to a Serial Device
RS-232 Port Overview
Pin
Number Signal Description
2 RXD
(Receive Data)
3 TXD
(Transmit Data)
4 DTR
(Data Terminal Ready)
5 GND
(Ground)
7 RTS
(Request to Send)
8 CTS
(Clear to Send)
Interfacing Serial Devices to the RS-232 Serial Port
GPIB-232CV-A User Manual
The RS-232 serial port on the GPIB-232CV-A uses a male 9-pin
D-Subminiature connector with a DTE interface configuration. Table B-1
shows the signal lines supported on the GPIB-232CV-A.

Table B-1. RS-232 Serial Port Signal Configuration

RS-232
Code
BB
BA
CD
AB
CA
CB
To interface other serial devices to the RS-232 serial port on the
GPIB-232CV-A, first refer to the manual that came with your serial device
to determine if the device is configured as a DTE or DCE. Also, determine
from the manual how the control lines are used and whether they must be
driven for the serial port to operate.
This signal carries serial data from the serial
device to the GPIB-232CV-A.
This signal carries serial data from the
GPIB-232CV-A to the serial device.
This signal is asserted by the GPIB-232CV-A to
signal that it has been powered on and is ready
to operate.
This signal establishes a reference point for all
interface voltages.
This signal is driven by the GPIB-232CV-A.
When asserted, it indicates that the
GPIB-232CV-A is ready to accept serial data.
When unasserted, it indicates that the
GPIB-232CV-A is no longer ready to accept
serial data because the buffer is full.
This signal is sensed by the GPIB-232CV-A.
When asserted, it indicates that the serial device
is ready to accept serial data. When unasserted,
it indicates that data transmission should be
disabled.
B-2
Function
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