CAN/485/422 Peripheral Card
Features• 2 CAN Channels
• Supports ARINC825 and CANaerospace Standards • Standard, Extended and Remote frames supported. • 8 maskable identifier filters. • 8-message Transmit and Receive FIFOs. • Re-transmission disable capability. • Monitor (Listen only) Mode • Selectable termination (On/Off) • JSafe Enabled • On-board Protection • 2 RS485 or RS422 Channels (selectable) • Selectable Slew rate (115kbps, 500kbps, and 10Mbps*) • Selectable termination (On/Off) • 4K RX and TX Buffers • JSafe Enabled • On-board Protection • 8 User I/Os with UART, SPI, I2C, PWM, GoJ-Safe & GPSM features *can be overdriven to 12.5Mbps |
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About
The J-Testr CARS Peripheral Card provides the user with dual CAN serial transceivers, dual RS422 or RS485 serial transceivers and optional dual ARINC429 serial transceivers.
Each CAN controller supports Standard, Extended and Remote Frames and includes all the required timing/protocol adjustment to be fully compliant with both the ARINC825 and CANaerospace standards. An eight deep transmit and receive buffer, as well as 8 maskable identifier filters, allow the CAN transceiver to be configured to significantly reduce test software overhead. A monitor-only mode allows the test software to ‘sniff’ the transmission between other CAN devices on the same bus, which can be useful when testing UUTs that have an internal CAN bus for cross device communication. Each CAN transceiver has selectable 120-Ohm termination to suit any bus topology.
The RS422/485 transceivers each allow either full duplex differential operation (RS422 mode), or half duplex differential operation (RS485 mode). The differential transmitters can be configured to have different slew rates, depending on the required application speed. This can often be beneficial to reduce reflections if the bus is either long or the connections are not optimal for high-speed use. Large transmit and receive buffers allow very large data packages to be send over the bus, at speed, with little or no test software intervention. Each RS4xx transceiver/receiver has selectable 120-Ohm termination to suit any bus topology.
The optional dual ARINC429 transceivers each have a fully independent transmitter and receiver allowing users to test avionic UUTs which have dual, redundant, communication busses. Each ARINC429 transceiver has a 32 deep transmit and receive message buffer, as well as programmable label recognition, which allows the device to be configured to significantly reduce test software overhead. Other configurations such as label bit order, parity enable on the 32nd transmit bit and a Self-Test Mode give the user great implementation flexibility.
All the serial transceivers on the CARS peripheral card have built-in electrical protection and are fully compatible with the internal J-Testr “J-Safe” mechanism.
Finally, as with all bus connected peripherals, the peripheral provides 8 general purpose User IOs which can be used to control and/or read custom circuitry on the interposer. The IOs can provide special hardware functions such as 16-bit PWM, UART, SPI, I2C, and GPSM (General Purpose Signal Monitor for measuring freq/duty/pulse-width etc.) that can be multiplexed to any of the IO pins.
Each CAN controller supports Standard, Extended and Remote Frames and includes all the required timing/protocol adjustment to be fully compliant with both the ARINC825 and CANaerospace standards. An eight deep transmit and receive buffer, as well as 8 maskable identifier filters, allow the CAN transceiver to be configured to significantly reduce test software overhead. A monitor-only mode allows the test software to ‘sniff’ the transmission between other CAN devices on the same bus, which can be useful when testing UUTs that have an internal CAN bus for cross device communication. Each CAN transceiver has selectable 120-Ohm termination to suit any bus topology.
The RS422/485 transceivers each allow either full duplex differential operation (RS422 mode), or half duplex differential operation (RS485 mode). The differential transmitters can be configured to have different slew rates, depending on the required application speed. This can often be beneficial to reduce reflections if the bus is either long or the connections are not optimal for high-speed use. Large transmit and receive buffers allow very large data packages to be send over the bus, at speed, with little or no test software intervention. Each RS4xx transceiver/receiver has selectable 120-Ohm termination to suit any bus topology.
The optional dual ARINC429 transceivers each have a fully independent transmitter and receiver allowing users to test avionic UUTs which have dual, redundant, communication busses. Each ARINC429 transceiver has a 32 deep transmit and receive message buffer, as well as programmable label recognition, which allows the device to be configured to significantly reduce test software overhead. Other configurations such as label bit order, parity enable on the 32nd transmit bit and a Self-Test Mode give the user great implementation flexibility.
All the serial transceivers on the CARS peripheral card have built-in electrical protection and are fully compatible with the internal J-Testr “J-Safe” mechanism.
Finally, as with all bus connected peripherals, the peripheral provides 8 general purpose User IOs which can be used to control and/or read custom circuitry on the interposer. The IOs can provide special hardware functions such as 16-bit PWM, UART, SPI, I2C, and GPSM (General Purpose Signal Monitor for measuring freq/duty/pulse-width etc.) that can be multiplexed to any of the IO pins.
