The Serial Port 7~2; Serial Port Type; Baud Rates - HP 4934A Operating And Calibration Manual

The Serial Port
The serial port is on the 4934A's right side, above the AC connector. Your unit will
have a serial port if a 200 kHz option is installed. This port is used for remote
control (see page 7-1) and for downloading software (see Software Downloading,
page 6-1).
Serial Port T^pe
The serial port is a DB-9S (9-pin socket) connector. The 4934A acts a DTE device;
if you are connecting to a DCE device you can use a straight- through cable (see
Cable Pinout, page 7-3). To connect another DTE device, a null-modem must be
used. The pinout of the serial port is as follows:
4934A TIMS Serial Port Pinout
Pin Number Functions
1
No connection.
2 TXD
Transmit data output.
The serial port uses the
following communication
3 RXD
Receive data input.
parameters:
4 DSR
Data set ready input.
•8 data bits
5
GND Ground,
• 1 stop bit
6 DIR
Data terminal ready output.
• Hardware flow control
7
CIS Clear to send input.
8 RTS
Request to send output.
9
No connection.
Baud Rates
The serial port supports the following baud rates: 300,1200,2400,9600,19200, and
38400. Note that 38400 baud is only available for software downloading. The
4934A always defaults to 9600 baud at power up.
To change the baud rate for remote control, see Setting the Baud Rate, page 7-4.
To change the baud rate for software downloading, see Quick Download Procedure,
page 6-2.
7-2 Remote Control