Chapter 2
Data Communications Testing
Specifying the timing settings
Data Communications and Diphase Testing Manual
January 2016
21148872, Rev. 002
Page 13
whether you are testing a balanced or unbalanced circuit for the interface, and the
receive input termination (balanced circuits only).
To specify interface settings
1
Select the
Setup
soft key, then select the
Interface
setup tab.
2
Select the interface, emulation mode, and, if applicable, balanced or unbalanced
setting for the circuit you are testing (for example
MIL-188-114
,
DTE
, and
Balanced
).
3
If you are testing a balanced circuit, select one of the predefined input termination
values, or select
Unterminated
.
The interface settings are specified.
Specifying the timing settings
After you specify the interface settings, you can specify the timing mode (synchronous
or asynchronous) for your test. When you specify the timing mode, you also specify the
clock source for the data received and transmitted from the instrument.
If you configured the instrument for synchronous testing, to use an internal or recovered
clock source, you can specify the synthesizer frequency for your test in kHz. You do not
need to specify the synthesizer frequency for synchronous testing if you are using a
clock source other than internal or recovered.
To specify timing settings
1
Select the
Setup
soft key, then select the
Timing
setup tab.
2
In Timing Mode, select
Synchronous
or
Asynchronous
.
If the field is disabled, the instrument is already configured to use the appropriate
timing mode for the interface. For example, when testing an EIA-530 or EIA-530A
interface, synchronous timing is the only appropriate mode; therefore, the value is
automatically set to Synchronous, and the field is disabled.
NOTE:
The clock sources available for transmitted and received data vary depend-
ing on the interface, emulation mode (DTE or DCE), and timing mode (syn-
chronous or asynchronous) you select for your test. See the Specifications
appendix of the Getting Started manual that shipped with your instrument for
a complete list of clock sources for each interface, emulation mode, and tim-
ing mode.
