Racal Instruments 1256E, Руководство пользователя

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1256E User Manual
Racal Instruments
©
2002 Computer Interfaces 4-23
Status: CR Only
5. If line 4 of the display already indicates the desired EOL
terminator, then no action is necessary. Otherwise, press the
fourth key. Rotate the knob until the desired EOL terminator
shows on line 4. In this example, “CR/LF” is desired:
-----SETTINGS-----
Type: RS-232
Option: Baud Rate
<Update?: CR/LF
Then press the fourth key to confirm the update. Pressing
any other button cancels the change.
When using a data terminal, or a computer with terminal-
emulation software, it is recommended that you set the 1256 to
use the CR-only terminator. In this case, also set the data
terminal or computer to half-duplex operation (local echo), with
line feed appended to incoming messages (see your data
terminal manual for information on how to do this).
NOTE
Menu preferences are not normally retained after the
power is removed from the instrument. To make (a)
menu preference(s) permanent, make the desired
change(s) to settings first and then proceed to the
section Storing the Menu Preferences to make the
changes permanent. Following this procedure will put
the settings into non-volatile memory and allow them
to be restored during instrument power-up.
Setting the
Data Bits,
Stop Bits, and
Parity
The 1256 allows the user to set the following additional RS-232
parameters:
•
Data bits: Data bits per frame. The RS-232 interface allows
either 7 or 8 bits per data frame. For most applications, set this
to 8.
•
Stop bits: Stop bits at end of each frame. The RS-232
interface can insert either one or two stop bits at the end of
each data frame. Slow data terminals may require the extra
delay resulting from two stop bits. However, for most
applications, one stop bit is sufficient.
•
Parity: Type of parity checking. Parity checking provides a
level of confidence that data has been received properly. When
parity checking is used, an extra bit (the parity bit), is inserted
at the end of each data frame. The RS-232 interface provides
three parity options: “none” (no checking performed), “even”