By Cary R. Spitzer
Renamed to mirror the elevated function of electronic electronics in smooth flight keep watch over structures, Cary Spitzer's industry-standard electronic Avionics guide, moment variation comes in complete volumes designed to supply concentrated assurance for experts operating in numerous components of avionics improvement. the 1st installment, Avionics: parts, software program, and capabilities covers the construction blocks and permitting applied sciences at the back of sleek avionics structures. It discusses information buses, screens, human components, criteria, and flight structures intimately and contains new chapters at the Time-Triggered Protocol (TTP), ARINC specification 653, communications, and motor vehicle well-being administration structures.
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Extra resources for Avionics: Elements, Software and Functions (2nd Edition) (The Avionics Handbook)
The rule in the assignment of bits in discrete numeric data words is to start with the least significant bit (LSB) of the word and to continue toward the most significant bit available in the word. There are two types of discrete words: general-purpose discrete words and dedicated discrete words. Seven labels (270 XX to 276 XX) are assigned to the general-purpose discrete words. These words are assigned in ascending label order (starting with 270 XX), where XX is the equipment identifier. 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 P SSM Data Pad Discretes SDI MSB Label LSB Generalized BCD word format P SSM BCD CH #1 BCD CH #2 BCD CH #3 BCD CH #4 BCD CH #5 SDI 4 2 1 8 4 2 1 8 4 2 18 4 2 1 8 4 2 1 8 7 6 5 4 3 2 1 0 0 0 0 1 0 0 0 0 0 0 1 Example 2 1 0 0 1 0 1 0 1 5 1 7 1 1 0 0 00 8 1 1 0 0 0 6 DME distance BCD word format example (No discretes) 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 P SSM Data Pad MSB Discretes SDI Label LSB Generalized BCD word format Maintenance Data (General Purpose) — The general-purpose maintenance words are assigned labels in sequential order, as are the labels for the general-purpose discrete words.
Pass-through data words are those words received by the unit and retransmitted without alteration. fm Page 8 Thursday, October 5, 2006 11:48 AM 2-8 Avionics: Elements, Software and Functions When the SSM code is used to transmit status and more than one reportable condition exists, the condition with the highest priority is encoded in bits number 30 and 31. The order of condition priorities is shown in the following table: Failure warning No computed data Functional test Normal operation Priority 1 Priority 2 Priority 3 Priority 4 Each data word type has its own unique utilization of the SSM field.
1 Subaddress Utilization The standard provides no guidance on how to use the subaddresses. The assignment of subaddresses and their functions (the data content) is left to the user. Most designers automatically start assigning subaddresses with 01 and count upwards. If the Instrumentation bit is going to be used, then the subaddresses must start at 16. The standard also requires that normal subaddresses be separated from broadcast subaddresses. If the broadcast option is implemented, then an additional memory block is required to receive broadcast commands.
Avionics: Elements, Software and Functions (2nd Edition) (The Avionics Handbook) by Cary R. Spitzer