DOC 6501_Release V
ATS-6501 Users Guide
40
2.7.2 hp5071A Communications
If users are operating with a High Performance 5071A they can set the system up so the ATS-
6501 is communicating with (monitoring) the 5071A select hp5071a (default)
ATS-6501>reference_type hp5071a
[OK] 2013-08-05T16:51:17Z
Note: Make sure the USB-to-Serial Converter (94001-5071A) is installed on one of the two USB
ports when the system is powered on (See Figure 6). If not, power the system down, plug the
cable in and re-apply power. The USB/Serial Cables are programmed to communicate with an
external reference (ATS 94000-115200) or to provide users access to the command port (94000-
115200). These cables are NOT interchangeable.
Caution: If the system is unable to communicate with the external reference and the
reference_type is hp5071A the Alarm light will come on and the Osc Lock light will go out and
remain this way after you switch to the external reference. Make sure you select the proper
reference_type before switching to external.
2.7.3 Unmonitored Clocks
If users are operating with a High Performance 5071A or maser and they are not monitoring the
hp5071a set the reference_type to cesium or maser respectively.
ATS-6501>reference_type cesium maser
[OK] 2013-08-05T16:51:17Z
2.7.4 Selecting the External Reference
Use the status reference:frequency:external command and verify the signal is present and locked
= true before switching to the external reference.
6501A_60>status reference:frequency:external
[communications] N/A (Good if monitored, See 2.7.2)
[locked] true
[signal] present
[OK] 2016-10-04T20:58:09Z
To set the reference to external use the reference command via the command port.
ATS-6501>reference external
[OK] 2013-08-05T17:19:32Z
Note: The Alarm light will come on and the Osc Lock light will go out for a few seconds when
you switch references. The system should clear all alarm indications within a few seconds.
To verify the settings use the settings reference command to check the current settings.
ATS-6501>settings reference
[external]
[type] hp5071A cesium maser
[source] internal
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