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Suggestions for another ASCII IRIG code, IRIG CS-5. |
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--[[Special:Contributions/207.232.27.5|207.232.27.5]] ([[User talk:207.232.27.5|talk]]) 10:34, 19 February 2008 (UTC)
== Another ASCII IRIG Code: CS-5 ==
[I'm not sure if this belongs here with the other IRIG codes, or if it is too specialized, since it is used primarily by NASA, and US military missile ranges.]
There is another ASCII IRIG code, IRIG CS-5, defined in IRIG Standard 215-12, "Asynchronous ASCII Event Count Status Codes" (https://apps.dtic.mil/sti/pdfs/ADA628275.pdf). It is used in missile and space launches to distribute the time till launch (e.g., "T minus 10 minutes, 13 seconds and counting"). There are four basic versions. The second digit indicates the resolution:
* 1 - 1 second resolution
* 2 - 0.1 second resolution
The following codes are defined:
* CS-511z: <SOH>I ±DDD HH:MM:SS #<CR><LF>
* CS-522z: <SOH>I ±DDD HH:MM:SS.S #<CR><LF>
* CS-513z: <SOH>I ±DDD HH:MM:SS # ddd hh:mm:ss.sss &<CR><LF>
* CS-524z: <SOH>I ±DDD HH:MM:SS.S # ddd hh:mm:ss.sss &<CR><LF>
where:
* <SOH> is an ASCII Start-Of-Header character.
* I is an identification character, usually blank.
* ± is the sign, minus before launch, plus afterwards.
* DDD is days to/from launch.
* HH is hours to/from launch.
* MM is minutes to/from launch.
* SS or SS.S is seconds to/from launch.
* # is the count status: "H" if holding, blank otherwise.
* ddd is the predicted or actual day of launch.
* hh is the predicted/actual hour of launch.
* mm is the predicted/actual minute of launch.
* ss.sss is the predicted/actual seconds of launch.
* & is "P" for predicted launch time, "A" for actual launch time.
* <CR> is ASCII carriage return.
* <LF> is ASCII linefeed.
The last digit of the code designation, z, indicates the baud rate:
* 2 - 300
* 3 - 600
* 4 - 1200
* 5 - 2400
* 6 - 4800
* 7 - 9600
* 8 - 19200
* 9 - 38400
IRIG CS-5259 is a multiplexed, eight-channel version of IRIG CS-524 transmitted at 38400 baud.
[There is another IRIG event count status code called IRIG CS-3, defined in IRIG Standard 209-90, "Event Count Status Code Formats" (https://www.trmc.osd.mil/wiki/download/attachments/113019844/209-90.pdf?version=1&modificationDate=1623181164780&api=v2). The first half looks almost like IRIG-B, except the time runs backwards until launch, and forwards afterwards. The second half is almost a duplicate of the first, and is zero until the time of launch, after which it holds the launch time. If there is any interest, I would be happy to do a write up on it.]
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