HP E8402A, User And Service Manual, Page: 38 / 249

40 Using the Enhanced Monitor Chapter 2
RS-232 Programming
The RS-232 port on the Enhanced Monitor is primarily a debug port,
designed for use with a dumb terminal or terminal emulator program on a
PC. This allows you to execute SCPI commands directly without an
application program and to monitor any errors in the error queue (including
those generated through the VXI interface programming). It also allows you
to query the Enhanced Monitor while the mainframe is in standby if an
ex5VDC is applied to the 5V EXT terminals. The RS-232 port is the
only possible source for temperature calibration since the mainframe must
be empty for temperature calibration.
Windows 95
®
and Windows NT
®
provide a terminal emulator program
called Terminal or HyperTeminal. These applets provide a convenient
method of using the Enhanced Monitor. Use an appropriate nine-pin female
to nine-pin female RS-232 cable (such as the HP 24542U) for connection
between the PC and the Enhanced Monitor. Configure the Terminal settings
for generic TTY, and the communication settings to match those of the
Enhanced Monitor.
Default RS-232 parameters are:
•
Baud: 9600
•
Bits: 8
•
Parity: None
•
Stop bits: 1
•
DTR/RTS: On
•
Pace: XON
•
Echo: On
•
ERES: On
•
Line buffer: On
Refer to Chapter 3 for RS-232 programming information. The
SYSTem:COMMunicate:SERial ...
commands set and/or modify the
configuration of the Enhanced Monitor’s serial interface. Serial
communication commands take effect after the end of the program message
containing the command(s).
Note
If you use the Enhanced Monitor RS-232 port (located on the back of
the mainframe) while the mainframe is in the standby mode, you
must supply an ex5Vdc to the +5VEXT connector (located
near the RS-232 port). If you use the RS-232 port while the
mainframe is powered on, you do not need to provide the external
+5Vdc.