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GPS Time Synchronization ION 7500 / ION 7600 User’s Guide
Page 354 Time Synchronization & Timekeeping Technical Note
Explanation of GPS:ARBITER & GPS:TRUETIME/DATUM ASCII Time String
Explanation of GPS:ARBITER-VORNE ASCII Time String
1
Explanation of <CR> and <LF> is the same as in the previous table.
The bytes in the time string must transmit continuously for the time
synchronization signals to be received correctly. When using a GPS receiver for
time synchronization, it is best to use it at 9600 baud rather than a higher baud rate.
This reduces the chance of bytes being interrupted and provides the best accuracy,
since the accuracy of the OTM depends on the baud rate.
ASCII Time String: <SOH>DDD:HH:MM:SSQ<CR><LF>
<SOH>
start of header (ASCII 01
hex
)
DDD day of the year
HH hours
MM minutes
SS seconds
Q quality flag
<CR>
carriage return (ASCII 0D
hex
)
<LF>
line feed (ASCII 0A
hex
)
ASCII Time String (below left)
1
44HHMMSS<CR><LF>
UTC/local time
55DDD<CR><LF>
day of the year
11NN<CR><LF>
out-of-lock time in minutes
<BEL>
<BEL> = hex 07