XLi Time & Frequency System 207
XLi-man, Issue 8, 6/17/2008, Rev. H
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5
1
SSSSSSSSSSSS SSSSSSSSSS SSSSSSS S SSS S SSSSS S
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 #OUTPUTPIN #OUTPUT
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