AT-DIO-32F (NI's classic AT bus 32-channel digital I/O card)

Brand: National Instruments (NI, American National Instruments)

Type: ISA/AT bus, 32-bit parallel high-speed digital I/O board card (an industrial legacy card, used for old PC/AT industrial control computers)

✅ Core Parameters (Simplified)

Channels: 32 DIO channels, divided into 4×8-bit ports (A/B/C/D)

Groups: A+B = Handshake Group 1; C+D = Handshake Group 2 (Each group can be independently set as input/output)

Level: TTL compatible (High ≈ 5V, Low ≈ 0V)

Transmission Rate: 450k bytes/second (High-speed parallel)

Handshake / Interrupt / DMA:

With REQ/ACK hardware handshake

3 on-board counters, interrupt support

2 DMA channels (default 5, 6 channels)

Connector: 50-pin male (J1)

Size: ISA full-length card (approx. 13.4 × 5.0 in)

Order Number: 180735-01, 776246-01

?? Key Features

Old ISA/AT bus: For DOS/Win9x/old industrial control computers, not PCI/CompactDAQ

Bidirectional configurable: Each group can be independently set as input/output, suitable for parallel port peripherals, old equipment control, relay arrays, TTL instruments

High-speed + DMA: Suitable for batch digital quantities, high-speed state acquisition, spare parts of old test systems

?? Typical Applications

Industrial control (old production lines, relay control)

Test measurement (TTL instruments, parallel interface devices)

Equipment renovation / spare parts replacement (repair of the original AT-DIO-32F system)