4 Remote Interface Reference
192 Keysight 34420A User’s Guide
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 meter uses the following frame formats for seven and
eight data bits.
Connection to a Computer or Terminal
To connect the meter to a computer or terminal, you must have the proper
interface cable. Most computers and terminal are DTE (Data Terminal Equipment)
devices. Since the meter 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.
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