ARINC 429 Data Bus Flashcards
The ARINC 429 DITS specifies the data transfer procedures between avionics system elements. This data transfer is accomplished through a ______ wires. Communication is uni-directional and simplex.
The ARINC 429 DITS specifies the data transfer procedures between avionics system elements. This data transfer is accomplished through a single twisted pair of shielded wires. Communication is uni-directional and simplex.
One avionics system element can transmit data over the bus to no more than ____ receiving system elements that require information. Bi-directional data transfer is not permitted. For bi-directional transmission, a second simplex bus would need to be added.
20
The shields are grounded at both ends to an aircraft ground which is close to the rack connector and at all production breaks in the cable. ______ is necessary to reduce undesired error in the system data transfer.
Grounding
Unlike some data transfer systems, the ARINC 429 DITS does not use bus controllers, remote transmitters or bus monitors to control data flow. The ARINC 429 DITS transfers data through the twisted wire pair using a ______. The signal can be either HI, NULL, or LOW. This data is transferred at one of two data speed rates, HIGH or LOW.
tri-level signal
What is the ARINC 429 DITS HIGH speed data rate?
1 kps
100 kps
14 kps
100 kps
1 kps is not a HIGH or LOW speed data rate for the ARINC 429 DITS.
14 kps is a LOW speed data rate for the ARINC 429 DITS, not a HIGH speed data rate.
The ARINC 429 DITS as stated earlier transfers data through the twisted wire pair using a tri-level signal. This signal, after sending a bit of data, returns to null before sending the next bit. This is known as “______.”
“Return to zero modulation.”
Similar to the RS-485 bus, the ARINC 429 DITS uses a balanced differential bus. Remember that a balanced differential bus takes the difference of two signals to produce ______.
Similar to the RS-485 bus, the ARINC 429 DITS uses a balanced differential bus. Remember that a balanced differential bus takes the difference of two signals to produce a virtually noise free output.
What is the range of allowable voltage levels for the HIGH state of the input signal to the receiver?
6.25 V to 13.0 V
