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XLi Time & Frequency System
139
XLi-man, Issue 8, 6/17/2008, Rev. H
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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 or TIET Event. 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><Source><S><Impedance><S><Type><S><Sign><S><Delay><S><Mode>
<S><Bypass><CR><LF>
Or
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:
F
= ASCII character F.
110
= function
number.
TIET
= ASCII character string “TIET” for configuring J1 for TIET measurement
<S>
= ASCII space character one or more
<Code>
= Input
Code:
IRIG-A, IRIG-B, NASA 36
Note:
F110 Input Code Notes: (1) IRIG doesn't contain “year” information. Enter the current
date using F3 before using IRIG as a primary reference source. Failure to do so can cause
the incorrect time information to be distributed
<Source>
= Clock source: PRIMARY, SECONDARY, STANDBY (Set IRIG to STANDBY for TIET)
<Impedance>
= 100K, 50 (50
Ω
impedance is selectable with DC type only)
Note:
If 50
Ω
impedance is specified with AM modulation format, XLi will overwrite the
impedance input 50
Ω
with 100 k
Ω
.
<Type>
= Code Type: AM, DC (AM type is selectable for 100 k
Ω
impedance only)
Note:
For DC code, set the appropriate level for the length of the input cable. Short runs
(<200 ft.) get 100 k
Ω
, and long runs (>200 ft.) get 50
Ω
.
<Sign>
= Code Sign: POSITIVE, NEGATIVE (Note: negative not supported with TIET)
<Delay>
= Propagation Delay: 0-99999
μ
S
<Mode>
= IRIG Mode: SYNC GEN
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