former part number PCI EncDAC-4D8, order: PCI-ED4 former part number VIP4-EncDAC, now order: IP-ED4 former part number PCI EncDAC-8D16, order: one PCI-ED4 plus one IP-ED4

Because the IP-ED4 IndustryPack module is used as an I/O interface for a host computer, it was expected that any host would have its own interval timer capability. Therefore the original IP-ED4 only provided software-programmable watchdog timer capability for its onboard DAC and relay outputs. The total watchdog timeout interval is software-programmable in 0.1 millisecond increments up to 25.5msec maximum.

Software selects whether the DACs are enabled with or without the timer. To use the timer, software sets the timer interval, enables the DAC and relay, and then software polls the timer data. If software did not read the timer before the end of the programmed interval, the timer would "time out", disable the DACs to zero volts, and turn off the relay.

The most recent revision of the IP-ED4 IndustryPack module incorporates an upgrade to the timer circuitry. In the latest revision, timer circuitry can now implement a software-programmable interval interrupt, as well as watchdog timeout capability. As before, the increments are 0.1milliseconds and maximum interval is 25.5 milliseconds. Software polling of the timer provides exactly the same data, and the same functionality (keeps DAC and relay enabled) as previous versions, so no existing software which accesses the IP-ED4 timer will need to change. New software can be written to take advantage of the interval interrupt capability.

The revised implementation is fully digital, the timing reference is the IndustryPack "CLK" clock signal from the host.

To identify the timer revision, check the IndustryPack ID PROM revision code; this functionality is available in PROM Revision D. Note that this IP-ED4 revision can be firmware programmed to exactly mimic the older (Revision B) functionality without interval interrupt capability, if this is needed users should request PROM revision C. Unless otherwise requested, all boards are shipping with Revision D firmware. For additional information, request a copy of the most recent IP-ED4 user manual.

PRODUCT CHANGE NOTICES.

ISA ENCoderDAC

The last large run of ISA EncDAC circuit boards was manufactured in 2001, and one final small batch in 2005. We still have a few 4-channel and 8-channel boards in stock. This product will be delisted from our product offerings when present stock is depleted. Similarly, I/O cables used with the ISA EncDAC will be delisted from our product offerings when present stock is depleted.

Digital I/O Expanders

In November 2003 we posted notice here that the ExpanderDig products were slated for discontinuation, as their functionality had been incorporated into newer, lower cost products (the ExpDigRelayxx products and the PCI-DIGxx products.) At that time we also announced that the Encoder/DAC product line was headed for a design revision due to component obsolescence, and that we intended to upgrade these products as part of the design revision...

PCI Dig144, ExpDigRel24 and ExpDigRel128 boards continue to be popular and remain in production, with no changes in pricing.

DISCONTINUED PRODUCTS .

As of October, 2004, ExpDig64 and ExpDig128 board production has ended and all stock has been sold. Digital I/O cables used with ExpDig64 and ExpDig128 Expanders will be delisted from our product offerings when present stock is depleted. PCI EncDAC combination product options which used ExpDig64 and ExpDig128 Expanders have been delisted from the product price list.

EMC Linux support for Vigilant EncoderDAC boards.

The Enhanced Machine Controller site www.linuxcnc.org suggests that their freeware supports the Vigilant ISA EncDAC board and the 4-axis PCI EncDAC board. As far as we can tell, their code utilizes only a small portion of our board's functionality. Vigilant Products is willing to assist any developer who will continue this development under our direction.