Multi-Tech Systems 7500 - Manual (Page 354)

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 and 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 >
start of header (ASCII 01
hex
)
DDD day of the year
HH hours
MM minutes
SS seconds
Q quality flag
carriage return (ASCII 0D
hex
)
line feed (ASCII 0A
hex
)
ASCII Time String (below left) 1
44HHMMSS UTC/local time
55DDD day of the year
11NN out-of-lock time in minutes
< BEL > = hex 07