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HD717 serial comms card with HDLC

Synchronous RS422/485 4MBits/sec HDLC Serial Comms PCMCIA Card - HD717

The HD717 uses an industry standard Serial Comms Controller Chip to support serial data formats such as HDLC, X25, Monosync and Bisync.  The same controller can also support various asynchronous data formats.  Because this controller can support up to 4MBits/sec on both TX and RX channels concurrently, it needs extra data buffering for use in high latency operating systems like Windows.  What makes the HD717 is unique is that rather than relying on the measly 4 byte buffer on-chip, we supplemented it with 4KByte FIFOs for both TX and RX data.  This means that even at maximum rate, the HD717 card can still maintain its data flow with under/over runs.

Technical Features

Chip Zilog 85233 SCC chip with unique supplementary 4KByte TX and RX FIFOs
Chip Bit-synchronous data rates up 4MBits/sec with RS422 differential interfaces, including HDLC, X25 etc
Chip RS422 drivers can be tri-stated under software control to allow half-duplex RS485 operation
Chip SCC supports RTZ, NRZ, NRZL, FM0 and FM1 encoding of serial data
Chip Flexible clock routing and generation architecture, supplementary to SCC's own baud rate generators
Chip SCC also supports asynchronous serial modes up to 1MBaud
Chip Fast interrupt driven architecture with access to FIFO flags as well as SCCs internal status registers
Chip Card also implements a low-rate data channel (unrelated to SCC) for use with flight recorder playback
Chip 8 general purpose digital I/O lines for monitoring and/or control
Software Card comes with Elan's Card Center Pro software with sample C++ code.
Working prototype driver/dll + source code available for Windows NT4 /W2000/XP solution.
software Automatic O.S. recognition and configuration.  Hot swappable PCMCIA 2.1+ compliant TypeII design
Power consumption Low power consumption: Typical 35mA at 5V, with software support for reduced power sleep mode
Cable options Supplied with 1m Type30 cable.  Connector latches into PC Card for security. Terminates to DB37 Female with male screw jacks
Cable options Can be fitted with Elan's unique Strain Relief Assembly to ruggedize the PC Card to cable connection (optional extra), product code "SRA1"

More Information

Download the UsersGuide (153KB) or contact us with a particular query.
Users Guides are in PDF format which can be read with Adobe Acrobat Reader  

HD717 - synchronous RS422/485 HDLC serial communications PCMCIA card