~~ODT~~
===== DISCRETE DATA =====
==== Type 0x28, Discrete Data, Format 0 ====
Reserved for future use.
----
==== Type 0x29, Discrete Data, Format 1 (Discrete Data) ====
Discrete Data, Format 1 packets are
used to record the state of discrete digital signals. In general, the discrete data packet will
contain multiple values from multiple discrete events.
The layout of the CSDW is shown in Figure 6-32. The uRecordState and
uAlignment flags are components of the discrete packet Mode field. See the Chapter 10
standard for further details. The uLength value is the number of Discrete Data message that
follow in the packet.
struct SuDiscreteF1_ChanSpec
{
uint32_t uRecordState : 1; // Record on state/time
uint32_t uAlignment : 1; // Data alignment
uint32_t uReserved1 : 1; //
uint32_t uLength : 5; // Number of bits
uint32_t uReserved2 : 24; //
};
Type 0x29 Discrete Data Format 1 CSDW
The layout of the Discrete Data message is shown in Figure 6-33. Each message contains
a time stamp and the state of the discrete data input signals. The suIntraPckTime field in
the data structures of represents event time in either 48-bit relative time format derived from the
RTC (format shown in Figure 6-5) , or as absolute time. If this time is absolute time, it is in
either Chapter 4 weighted 48-bit time (format shown in Figure 6-6) or IEEE 1588 time format
(format shown in Figure 6-7).
struct SuDiscreteF1
{
uint64_t suIntraPckTime; // Intra-packet time stamp
uint32_t suData; // Data about the event
};
Type 0x29 Discrete Data Format 1 message
The IRIG 07 Chapter 10 and prior standard incorrectly states that Bit 7 of the Packet
Flags (in the packet header) is used to determine if the intra-packet time is relative time or
absolute time. The correct bit to use is Bit 6. It is anticipated that with will be corrected in a
future release
----
==== Type 0x2A - 0x2F, Discrete Data, Format 2 - Format 7 ====
Reserved for future use.