There are two configurations available:

• Specify HSDENGW, P/N: 0800125 for unidirectional communications.
• Specify HSDENGW2, P/N: 0800135 for bidirectional communications.

Both configurations include a black 19" rack mount enclosure (which contains: motherboard, memory, hard disk, floppy disk, Ethernet card, PCHSD2® or, PCIHSD2®,and SVGA controller), keyboard, monitor, 20 foot cables, manuals, and software. You can E-mail us at sales@appdatsci.com or call us at 972-620-8530 for pricing information.

The HSDENGW2 communicates with the Host by emulating a device that would normally be connected to an HSD. Each data transfer from the host is transmitted to the LAN as a packet, using the User Datagram Protocol (UDP). Packets received from the LAN are held, space permitting, until the Host initiates a read operation.

The HSDENGW2 can typically transfer data on the IBL link at rates between 1.0 and 1.25 Megabytes per second. The maximum data transfer size is fixed by the maximum allowable UDP packet size and the overall transfer rate is determined by the TCP/IP protocol stack and loading on the LAN.

The PCHSD2 provides a 32-bit data bus transfer from the HSDII or compatible external device. The data is then transferred via 16-bit data bus transfer to the PC memory. The relationship between the most significant and least significant bits for the PC and the HSD words are illustrated in the following sketch.

The data may also be byte or 16-bit word swapped between the PCHSD2 board's FIFO and HSD/IBL port. As the illustration below shows, if byte swap is enabled, bytes 0 & 1 and 2 & 3 are swapped. If word swap is enabled, bits 31 - 16 and 15 - 00 are swapped. Also, byte and word swap can be enabled simultaneously.

Byte and word swapping in the PCHSD2 is controlled by configuration parameters. No other byte order transformation is done before data is presented to the network interface.

The HSDENGW2 consists of a standard ISA-bus Personal Computer in either a desktop or rack mount enclosure with PCHSD2 and Ethernet interfaces installed. The software controlling the HSDENGW2 runs under MS-DOS and starts automatically on system boot-up. Configuration of the gateway is controlled by parameters read from text files that may be changed with any standard text editor.

The HSDENGW2 requires 110/220 VAC power only.