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XLi Time & Frequency System
207
XLi-man, Issue 8, 6/17/2008, Rev. H
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PTTI BCD Output (87-8045)
The PTTI BCD Time Code is compliant with ICD-GPS-060 Rev B as a 50 bit message. It also supports
an abbreviated format, commonly referred to as 24 bit format. There are two outputs, one each on 9 pin-
D connectors. Selection is via the Keypad / Display, RS232/422 and the Network port via telnet and
HTML.
THE PTTI BCD TIME CODE FORMAT IS:
The PTTI BCD time code is a 50 bit message defining the UTC time of day, day of year, and TFOM
transmitted at 50 bps. The time code represents the previous 1PPS rollover.
THE ABBREVIATED PTTI BCD TIME CODE FORMAT IS:
The abbreviated PTTI BCD time code is a 24 bit message defining the UTC time of day. The day of year,
and TFOM bits are set high (1) transmitted at 50 bps. The time code represents the previous 1PPS
rollover.
9 PIN-D SPECIFICATION:
Connector:
J1 and J2 Male 9-pin D subminiature.
Pin Assignment:
1------ N/C
2------TX+ (Code out Plus)
3------RX+ (Code in Plus - for test purposes only)
4------RX- (Code in Minus - for test purposes only)
18
2’s of days
43
4’s of min
19
200’s of msec
44
Unlock
20
4’s of days
45
8’s of min
21
400’s of msec
46
Ground
22
8’s of days
47
10’s of min
23
800’s of msec
48
1kPPS
STROBE
24
10’s of days
49
20’s of min
25
1’s of sec
50
Ground
Table 9:
PIN #
OUTPUT
PIN #
OUTPUT
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