GPS Time Synchronization

ION 7500 / ION 7600 User’s Guide

 

 

Explanation of GPS:ARBITER & GPS:TRUETIME/DATUM ASCII Time String

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 0Dhex)

 

 

<LF>

line feed (ASCII 0Ahex)

 

 

Explanation of GPS:ARBITER-VORNE ASCII Time String

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

 

 

1Explanation 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.

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Time Synchronization & Timekeeping Technical Note

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Multi-Tech Systems 7600 Explanation of GPSARBITER-VORNE Ascii Time String, Ascii Time String Sohdddhhmmssqcrlf, 11NNCRLF
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