2. Each press of the START keypad will produce an additional one-
second freeze pulse.
3. Pressing the “>” key will increase the setting up to a maximum of
255. Pressing the “<” key will decrease the setting to a minimum
of 150.
4. Press ENTER to store the new setting (or STOP to restore the
original setting).
Using the Model 4250’s RS-232 port (Figure 7)
The RS-232 port allows you to output to an external device, such as a
computer. Almost every item of information displayed by your instru-
ment is also transmitted over the RS-232 port, including test results, all
error messages, and most display data from the diagnostic menu.
The default serial data rate for communications is 9600 bps (bits per
second), though you may alternatively select 1200, 2400, 4800, and
19200 bps.
The DB-9 RS-232 port on your instrument conforms to the DTE
EIA-232C standard and can reliably communicate over shielded cable
up to 10 meters in length, depending on the baud rate you use.
NOTE
• Your instrument is only designed to support unidirectional
communication with an external device. At this time, there
is no protocol for bidirectional communication.
• For a sample RS-232 Port Setup, please see the RS-232
Supplemental Information, Appendix E at the end of this
user’s guide.
• This instrument requires the use of a null modem RS-232C
cable. There are several variations on null modem cables.
Advanced Instruments. recommends that you purchase a RS-
232C cable direct from our factory.
33
Instrument Operation
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