|
Description
The Sensoray Model 425 low cost interface saves
space in ISA bus systems by combining five functions into a half-size module. Four flat
cables connect the Model 425 to external breakout boards.
Encoders
The 24-bit up/down counter channels are
optimized for incremental encoders. Each channel accepts two phased TTL or RS-422 signals,
plus an index signal, to track encoder direction and displacement. Unlike conventional
counters, the 425 counters do not accumulate errors when the encoder dithers or changes
direction. The 425 supplies 5-volt power to all encoder channels. Each counter can be
programmed to function as an encoder interface or as a general-purpose timer and may
optionally generate interrupts. To ensure maximum flexibility, no counter functions are
used by any other on-board peripheral devices. |
|
|
|
|
|
|
Watchdog
The 425's watchdog timer output may be routed
to either bus reset or nonmaskable interrupt. It may be enabled or disabled under program
control. The timer is automatically disabled whenever a bus reset occurs.
Digital I/O
The Model 425 has forty-eight high-current
digital I/O channels with connector pinouts designed for direct connection to industry-
standard solid relay boards. Each line is software programmable as either input or output.
Sixteen of the channels may be programmed for edge detection and interrupts. Read-back
circuitry enables the physical state of output lines to be monitored. Whenever a system
reset occurs, all output channels are automatically turned off. |
|
|
|