TEK-TCG 01-G-Manual-v6-052021
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String-B Time Code O/P on P4
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.
Comms
9600bps, 8-bit ASCII, no parity
Definition
<SOH> DDD:hh:mm:ssQ<CR><LF>
Refer to String-A table (above) for the definitions of the common digits
“Quality” Character (Q)
Meaning
HEX
ASCII
20
‘ ’ (space)
Clock in sync, timing accuracy is better than 60 ns
2E
‘.’ (full stop)
Clock is accurate to 1 µs
2A
‘*’
Clock is accurate to 10 µs
23
‘#’
Clock is accurate to 100 µs
3F
‘?’
Clock accuracy may be worse than 100 µs
Example
Interpretation
<SOH>112:12:34:36?<CR><LF>
day 112, time: 12:34:36, >100 µs sync error
