53A-426 – QUAD ARINC 429 Receiver Card
OPT 20 – 53A-427 Compatibility on Channel 4 Only
53A-746– Data Cable. or
53A-780 – Hooded Connector

• Four independently programmable ARINC 429 receiver channels
• Each channel may store up to 30,000 ARINC 429 words
• Monitor, Select-label, Limit checking, and All-label data capture modes
• Sequential data storage with “on-the-fly” data-retrieval using high-speed block transfers
• GSA item

The 53A-426 Quad ARINC 429 Receiver Card is designed to test and analyze data received from the Mark 33 Digital Information Transfer System (DITS) found on commercial aircraft. The 53A-426 Card provides four independent receiver channels, each having a buffer memory capable of storing up to 32.000 ARINC 429 words (four bytes per word).

In real time, incoming data is analyzed for format errors and then stored in memory. Data is stored with or without an error byte and “time-stamp” indicating the time of receipt. Data stored in memory is immediately accessible by the system controller, without interrupting the storage of additional data.

Each of the four channels individually captures ARINC 429 data using any one of the Card’s four primary data capture modes.

Monitor Mode
In Monitor Mode, a channel captures all ARINC 429 traffic received on the DITS bus, storing the captured data in on-card memory in the order received.

Select-labels Monitor Mode
In Select-labels Monitor Mode, a channel stores data based on a user defined list of up to six ARINC 429 labels. For each of the user-defined labels, the Select-labels Monitor Mode also allows the data capture to be further restricted by defining the value of the received ARINC 429 word source/destination-identifier (SDI) field and/or the sign/status-matrix (SSM) field. (A definition of the SDI and SSM fields may be found in the ARINC 429 specification.)

Limit-checking Mode
In Limit-checking mode. a channel observes and stores ARINC 429 data based on a single user-defined label (or label together with the SDI and/or the SSM fields). The user further specifies a trigger limit against which the value of incoming data for the specified label is checked. The channel captures a user-defined number of words received before and after a trigger condition occurs. If interrupts are enabled, the channel will generate an interrupt to the system controller when both the limiting condition has been met, and the preset number of bytes has been captured.

All-label Mode
In All-label Mode, a channel captures and stores the latest 32-bit ARINC 429 word received for each of the 256 ARINC 429 labels and their associated sixteen possible combinations of SDI and SSM fields. A total of sixteen ARINC 429 data word locations are assigned in memory for each possible ARINC 429 label.

In All-label mode, a subset list of up to 50 labels may be specified for any selected channel. Data will be returned for those labels in response to subsequent input requests from the controller. This minimizes programmed I/O overhead and can greatly improve system data retrieval rates.

Individual channels can be connected in parallel to provide multiple data capture modes for a single ARINC 429 data bus.

Within each of the primary data-capture modes, data may be stored in one of three ways:
– ARINC 429 data words only.
– ARINC 429 data words plus time-stamp and error bytes.
– Only those ARINC 429 data words (including time-stamp and error bytes) in which an error has occurred.

The data storage method is programmable for each channel individually, while the data errors detected include incorrect interword gap time, number of data bits and parity errors. When data time-stamping is selected, the time of receipt of each data word is stored in memory along with the data word. The time-stamp resolution for all four channels can be set in decade steps from 10 µsec to 100 msec.

Data stored in memory can be read “on-the-fly” by the system controller,  i.e .. while the 53A-426 Card continues to receive data. In Monitor and Select-labels modes, data is stored in a first-in-first-out (FIFO) structure so that reading data frees storage locations for further data capture. In All-label mode, memory is continuously updated to reflect the most current data received. Older data is not retained by the Card. In Limit-checking mode the most current data being received is available to the system controller until the trigger event occurs.

Following the trigger occurrence, the number of words specified by the user are stored and data capture ceases until the channel is re-enabled.

Extensive Built-In-Test Equipment (“BITE'”) is provided, including a self test of RAM memories and individual front end processors. Status LEDs at the front edge of the card provide a visual indication of data reception, programming errors, and received data errors on each channel. Error conditions may also be reported directly to the system controller using the Error Return command.

Four independent ARINC 429 Receiver channels.

Connects directly to Mark 33 DITS bus.

Storage Capacity/Channel:
Monitor Mode:
32,000 ARINC 429 words without time-stamp/error storage.
16,000 ARINC 429 words with time-stamp/error storage.
Select-labels Mode:
32,000 ARINC 429 words without time-stamp/error storage.
16,000 ARINC 429 words with time-stamp/error storage.
Limit-checking Mode:
32,000 ARINC 429 words without time-stamp/error storage.
16.000 ARINC 429 words with time-stamp/error storage.
All-label Mode:
1 ARINC 429 word per label with or without time-stamp/error storage.
1 ARINC 429 word per label and SDI and/or SSM field combination (16 ARINC 429 data word locations for each possible label) with or without time-stamp/error storage.

Time-stamp Range/Resolution (programmable):
10 µsec to .65535 sec in 10 µsec steps.
100 µsec to 6.5535 sec in 100 µsec steps.
1 msec to 65.535 sec in l msec steps.
10 msec to 655.35 sec in 10 msec steps.
100 msec to 6553.5 sec in 100 msec steps.

Receive Data Rates:
High-speed, 100 Kbits per second.
Low-speed, 12.0 to 14.5 Kbits per second.
For other ranges, consult factory.

Received Data Error Detection:
Parity, word length and inter-word gap.

Inter-word Gap Time:
High-speed (100 kb/s data rate), 35 µsec, nominal.
Low-speed (12.0 to 14.5 kb/s data rate), 266 µsec nominal.

Programmed By:
ASCII characters or ASCII characters followed by binary data bytes.

Recommended Cable (not supplied):
53A-746 Data Cable or
53A-780 Hooded Connector.

Note: If the 53A-426 is going to be used with the 53A-427 for the low speed data rates of ARINC 561, order Option 20 to the 53A-426.

Available Option:
OPT 20, 53A-427 compatibility on channel 4 only.