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F110 – J1 Input (Time Code, TIET)

• Input Polarity: Positive only

Upon changing the settings, the last display prompt asks:

• Save Changes?: (Yes, No) Yes applies the changes. No cancels the changes.

For J1 specifications, See "Standard I/O" on page 5

• Time Code: The XL-GPS expects time code input that provides UTC in 24-hour

format. If the time code does not provide UTC in 24-hour format (e.g., it uses

standard, local, or GPS time, or is in 12-hour format), the XL-GPS’s internal clock will

be set to the wrong time when it uses the time code reference, and its time outputs

will be similarly affected.

• Time Code: IRIG and NASA 36 time code don’t contain “year” information. Enter the

current year using F3 before using IRIG as a primary or secondary reference source.

Failure to do so can cause the incorrect time information to be distributed. See “F3 –

Time & Date” on page52.

• At the end of the year, the year increments by one (e.g., 2004 -> 2005), provided the

XL-GPS is operating during the transition. If it is not operating during the transition,

the time code reasserts the preceding year when used as a reference source.

• TIET: Put the F110 time code input on STANDBY first before configuring F110 for

TIET.

• TIET: Stray capacitance loading on the J1 input adversely impacts TIET

measurements.

Command Line

F110 can configure the J1 input port to IRIG-A, IRIG-B, NASA 36, TIET Time, TIET Event,

or IRIG 1344. Use F110 to enter or request the J1 Input Configuration.

To request the J1 Input Configuration, enter:

F110<CR>

The function responds with the ASCII character string:

F110<S><Code><S>-

F110<S>TIET<S><Impedance><S><Sign><CR><LF>

(when TIET option is enabled and J1 is set to TIET)

Where the F110 entry and request formats are defined as:

098-00116-000 Rev. A............................... Page 129 of 221

Symmetricom XL-GPS User Manual

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