ARINC 429 4Tx/2Tx USB and RS422 converter
This converter (Part No. A429-R4/T2-USB-RS422-R1/T1) employs a 2-Channel ARINC 429 transmitter and a 4-Channel receiver with an USB/RS422 serial interface. The converter is housed in one of our standard ruggedised CNC machined blue anodised enclosures enabling it to be compliant with the most common sections RTCA DO-160 for aircraft environments.
This converter will find applications where mulitiple ARINC 429 transmit and receive channels are required with an associated USB or RS422 serial interface.
The converter can be powered from a standard aircraft 28V DC power supply with a better than 4:1 input voltage ratio of 12 to 72 volts. The transmitter employs a standard ARINC 429 line driver interface supporting 12.5/50/100 k/bps data bit rates.
The receiver employs an opto-isolator input providing electrical isolation between the aircraft data bus and the converter electronics.
This converter offers extremely comprehensive features and the firmware has been proven in the field for over eight years without any reported issues.
ARINC 429 4Tx/2Tx USB and RS422 converter Detail
This converter can operate in one of two modes of operation, "Direct" or "Table" mode. These modes can be set independently of each channel.
In Direct Send Mode, ARINC 429 data will be transmitted onto the ARINC 429 bus immediately after it has been received from the host via the serial port.
In Direct Receive Mode, all valid received Labels from the ARINC 429 receiver channels will be written to the serial port.
The default data transfer consists of a 5-byte sequence consisting of a Header Byte and the four bytes of the ARINC 429 word. The Header byte contains information such as the channel ID, etc.
Table Mode - ARINC 429 Transmission
In Table Send Mode, ARINC 429 words are transmitted on to the bus periodically in frames of data independent of the host.
ARINC 429 Data values are loaded or updated by sending a command followed by four serial bytes containing the new 32 bits of ARINC 429 data. The same value will continue to be transmitted periodically until it is updated.
The rate of transmission for each label can be specified by the host using a command followed by four bytes containing the Label number, the Rate and the Group information (frames).
Table Mode - ARINC 429 Reception
This mode permits the filtering of specified received ARINC 429 labels from the specified channels. In addition to filtering labels, a "count value" can be assigned to each label such that a multiple reception of labels must occur before it will be transmitted to the host via the serial port. This effectively reduces the amount of traffic on the serial port. The interface can accommodate 100% bus loading.
ARINC 429 automatic bit rate recognition
The receiver channel will automatically adapt to the incoming ARINC 429 bit rate. The received bit rate can be interrogated by the host.
The Parity can be set independently for teach transmit and receive channel.
Parity checking on receive can be set to ODD, EVEN or NONE.
Parity generation on transmitted words is automatic and can be set for ODD, EVEN or NONE.
Selecting NONE allows control of Bit-32 by the host for transmitted words.
Time Stamp of Received ARINC 429
A 24-bit time stamp mode can be enabled, which will be appended to the 32-bits of ARINC 429 data received by the host over the serial bus.
Interrogation of installed firmware revision and updating
The host can interrogate the currently installed version of firmware. The firmware can be updated via the serial port when required.
Unique serial number
Each converter contains a unique serial number that can be interrogated by the host in order to identify multiple converters installed within an installation.
More information can be found in the user manual.
ARINC 429 4Tx/2Tx USB and RS422 converter Specifications
- 4-Channel ARINC 429 receiver