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.
A/D
Eight differential input channels are multiplexed to a sample/hold amplifier and high-speed A/D converter. A resistor-programmable instrumentation amplifier allows gains of 1 to 1000. An on-board DC/DC supply ensures A/D linearity for 10-volt input signals.
D/A
Four voltage outputs channels may be programmed for 0 to 10 volts. One channel has a remote sense input to minimize line loss errors. All outputs are automatically reset to zero volts whenever a bus or soft reset occurs.
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.
Specifications
| Operating temperature |
-25C to +70C |
| PC bus interface |
I/O mapped, 16 ports |
| Input power |
< 3 watts |
| A/D Converter |
| Conversion time |
20 uS |
| Number of channels |
8 differential |
| Input resistance |
100 Megohms |
| CMRR |
100 dB minimum |
| Max. common mode voltage |
5 volts |
| Resolution |
12-bits |
| Accuracy |
14-bits |
| Input ranges |
+/-10, ±5 V |
| Offset error |
+/- 1/2 LSB |
| D/A converter |
| Conversion time |
200 uS |
| Resolution |
12-bits |
| Offset error |
+/- 2 LSB |
| Output voltage |
+/- 10 volts |
| Output resistance |
87 ohms |
| Digital I/O |
|
| Number of channels |
48 bi-directional |
| Output voltage |
0 to 5 V open collector |
| Output sink current |
100 mA @1.1 V |
| Encoder I/O |
|
| Number of channels |
3 quadrature, 16-bit |
| Input voltage |
TTL or RS-422 |
| Input frequency |
350 kHz |
| Watchdog Timer Time-out |
Time-out: 500 mS
2-pin connector may be connected to the bus reset line to allow a system reset from software |
Images and Mechanical Drawings
Prices
| Model 425 |
Analog & Digital Interface |
Qty:1 $630 |
Qty:2-9 $571 |
| Model 7409C |
18" analog cable, 40-pin |
Qty:1 $14 |
Qty:2-9 $12 |
| Model 7409C1 |
1 meter analog cable, 40-pin |
Qty:1 $28 |
Qty:2-9 $25 |
| Model 7409TB |
Low cost analog screw terminal board |
Qty:1 $65 |
Qty:2-9 $59 |
| Model 7409TC |
Screw terminal board with proto area |
Qty:1 $105 |
Qty:2-9 $95 |
| Model 7409TDIN |
Screw terminal board with proto area and DIN snap rails |
Qty:1 $140 |
Qty:2-9 $125 |
| Model 7501C |
18" digital cable, 50-pin |
Qty:1 $17 |
Qty:2-9 $15 |
| Model 7501C1 |
1 meter digital cable, 50-pin |
Qty:1 $30 |
Qty:2-9 $27 |
| Model 720RB |
24 position relay board w/o DIN |
Qty:1 $145 |
Qty:2-9 $130 |
| Model 7505TDIN |
24 position relay board
with DIN snap rails |
Qty. 1 $79 |
Qty. 2-9 $72 |
| Model 720RB |
Solid State Relay Board |
Qty. 1 $145 |
Qty. 2-9 $130 |
| Model 720RBDIN |
Solid State Relay Board |
Qty. 1 $180 |
Qty. 2-9 $165 |
| Model 7502C |
18" encoder cable, 20-pin |
Qty. 1 $12 |
Qty. 2-9 $11 |
| Model 7502C1 |
1 meter encoder cable, 20-pin |
Qty. 1 $25 |
Qty. 2-9 $23 |
| Model 7506TDIN |
40 contact terminal board |
Qty. 1 $79 |
Qty. 2-9 $72 |
| Model 7505TDIN |
50 contact terminal board |
Qty. 1 $79 |
Qty. 2-9 $72 |
| Model 7502TDIN |
Screw terminal board with DIN snap rails |
Qty. 1 $49 |
Qty. 2-9 $49 |
