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PTP Translator Manual / December 2014 9
String-A Time Code O/P
About
This code is very similar in data content to the IRIG J-17 code, but adds a two-character field
containing the year, and uses 8-bit ASCII, no parity data format.
Timing
Transmitted once every second. The leading edge of the “start” bit of the first character <SOH> is
exactly on the second that the message describes.
Default Comms 9600 bps, 8-bit ASCII, no parity
Definition <SOH>ddd:hh:mm:ss:yy<CR><LF>
Placeholder Content
ddd Day of Year: range “001” – “366”
: HEX 3A
hh hour: “00” – ”23”
mm minute: “00” – “59”
ss seconds: “00” – “59”
yy year: “00” – “99” representing the last two digits of the year since 2000
Example Interpretation:
<SOH>112:12:34:36:10<CR><LF> day 112, time 12:34:36, year (20)10
String-B Time Code O/P
About
This code substitutes a “Quality” indicator byte for the year field, but otherwise is identical in form,
function and timing to String-A.
Timing
Transmitted once every second. The leading edge of the “start” bit of the first character <SOH> is
exactly on the second that the message describes.
Default Comms 9600 bps, 8-bit ASCII, no parity
Definition <SOH> ddd:hh:mm:ssQ<CR><LF>
“Quality” Character (Q) Content
HEX ASCII
20 ‘ ’ (space) Clock in sync, timing accuracy is better than 60 ns
2E ‘.’ (full stop)
Clock is accurate to 1
µ
s
2A ‘*’
Clock is accurate to 10
µ
s
23 ‘#’
Clock is accurate to 100
µ
s
3F ‘?’
Clock accuracy may be worse than 100
µ
s
*Refer to String-A table (above) for the definitions of the common digits
Example Interpretation:
<SOH>112:12:34:36?<CR><LF> day 112, time: 12:34:36, >100
µ
s sync error
String-C Time Code O/P
About
This code is effectively a combination of String-A and String B. It provides both year information
and a sync indicator field.
Timing
Transmitted once every second. The leading edge of the “start” bit of the first character, <CR>, is
exactly on the second to which the message data refers.
Default Comms 9600 bps, 8-bit ASCII, no parity
Definition <CR><LF>Q

yy

ddd

hh

mm

ss.000

Placeholder Content
Q Quality indicator: ‘ ‘ = in-sync, ‘?’ = out-of-sync
 HEX 20 (space)
yy Year: “00” – “99” representing the last two digits of the year
ddd Day of year: range “001” – “366”