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"Smarter Timing Solutions"
Appendix
H
Time Code Formats
An optional feature of your RTM3205 Precision Timing Module is one amplitude-modulated time
code output, or up to four DC-shift time code outputs. Time codes are commonly used to provide
time information to external devices such as displays, magnetic tape devices, strip chart recorders
and several types of embedded computer peripheral cards. The output code format is selectable via a
console command. See
Chapter 10 - Inputs/Outputs, Time Code Option
. Each format is described
below.
IRIG-B122/002
This is the most widely used format and is normally the factory default. The IRIG-B122 format is
a 100 bps code and is used to amplitude modulate a 1000 kHz sine wave carrier. The information
contained in the time code is seconds through day-of-year coded in Binary Coded Decimal (BCD).
Reference IRIG Document 104-60.
IRIG-B123/003
In addition to the time information identified in B122 above, this format also contains Straight Binary
Seconds (SBS) of day. SBS is provided at the end of the frame, in the 17 bits starting in position 80.
IRIG-B120/000 (IEEE-Standard 1344-1995)
In addition to the time data and the Straight Binary Seconds data this format provides for time/sta-
tus data in the control bit positions of IRIG-B. The information provided there is defined by IEEE
standard 1344-1995: Unit and Tens of Years, Leap Second, DaylightSaving Time, Local Time Offset,
Time Quality and Parity. The IEEE-1344 table provided below shows each bit position with detailed
information.
NASA-36
NASA-36 bit time code is a 100-bit, pulse width modulated format used to amplitude modulate a
1000 kHz sine wave carrier. The information contained in the time code is seconds, minutes, hours
and days. The format is used by several military ranges. Reference IRIG Document 104-59.
2137
The 2137 code is a 25-bit pulse width modulated format used to amplitude modulate a 1000 kHz sine
wave carrier. The information contained in the time code is seconds, minutes and hours. The format
is used by certain security organizations.
Summary of Contents for RTM3205
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