8 Time Strings
8.14 Format of the IRIG J Time String
The time code consists of ASCII characters, send in the format 7O1
• 1 start bit
• 7 data bits
• 1 parity bit (odd)
• 1 stop bit
The on-time marker is represented by the leading edge of the start bit. The time code consists of 15 characters,
sent once per second at a baud rate of 300 or greater. The format is:
<SOH>DDD:HH:MM:SS<CR><LF>
The letters printed in italics are replaced by ASCII numbers whereas the other characters are part of the
time string. The groups of characters as defined below:
SOH ASCII code „Start of Heading“ (0x01h)
DDD ordinal date, day of year (1 to 366)
HH, MM, SS time of the start bit given in hour (HH), minute (MM), second (SS)
CR ASCII code „Carriage Return“ (0x0Dh)
LF ASCII code „Line Feed“ (0x0Ah)
SyncBox N2X Date: 17th September 2019 41
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