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Chapter 4 Remote Interface Reference
RS-232 Interface Configuration
4
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 bits from the start bit to the
stop bit, inclusively. Within the frame, you can select the baud rate,
number of data bits, and parity type. The function generator uses the
following frame formats for seven and eight data bits.
Connection to a Computer
To connect the function generator to a computer, you must have
the proper interface cable. Most computers are DTE (Data Terminal
Equipment) devices. Since the function generator 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.
Start
Bit
Stop
Bit
Parity
Bit
Parity:
Even, Odd
Parity:
None
Start
Bit
Stop
Bit
7 Data Bits
8 Data Bits
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