RS-232 Data Frame Format
A character
frame
consists of all the transmitted bits that make up a
single character. The frame is defined as the characters from the
start bit
to the last
stop bit
, inclusively. Within the frame, you can select the
baud rate, number of data bits, and parity type. The multimeter uses
the following frame formats for seven and eight data bits.
Connection to a Computer or Terminal
To connect the multimeter to a computer or terminal, you must have
the proper interface cable. Most computers and terminals are
DTE
(
Data Terminal Equipment
) devices. Since the multimeter is also a
DTE
device, you must use a
DTE
-to-
DTE
interface cable. These cables are also
called
null-modem
,
modem-eliminator
, or
crossover
cables.
The interface cable must also have the proper connector on each end
and the internal wiring must be correct. Connectors typically have
9 pins (
DB
-9 connector) or 25 pins (
DB
-25 connector) with a “male”
or “female” pin configuration. A male connector has pins inside the
connector shell and a female connector has holes inside the connector shell.
If you cannot find the correct cable for your configuration, you may
have to use a
wiring adapter
. If you are using a
DTE
-to-
DTE
cable, make
sure the adapter is a “straight-through” type. Typical adapters include
gender changers, null-modem adapters, and
DB
-9 to
DB
-25 adapters.
Refer to the cable and adapter diagrams on the following page to
connect the multimeter to most computers or terminals. If your
configuration is different than those described, order the
HP 34399A
Adapter Kit
. This kit contains adapters for connection to other
computers, terminals, and modems. Instructions and pin diagrams are
included with the adapter kit.
4
Chapter 4 Remote Interface Reference
RS-232 Interface Configuration
149
Summary of Contents for 34401A
Page 12: ...1 Quick Start 1 ...
Page 26: ...2 Front Panel Menu Operation 2 ...
Page 50: ...3 Features and Functions 3 ...
Page 103: ...4 Remote Interface Reference 4 ...
Page 135: ...SCPI Status System 4 Chapter 4 Remote Interface Reference The SCPI Status Model 135 ...
Page 170: ...5 Error Messages 5 ...
Page 182: ...6 Application Programs 6 ...
Page 196: ...7 Measurement Tutorial 7 ...
Page 214: ...8 Specifications 8 ...