I. Basic Information

Model: PCI-DIO-32 (= PCI-DIO-32HS = PCI-6533)

Part Number: 777314-01

Bus: 32-bit PCI (5 V, 33 MHz), does not support PCIe

Channels: 32 bidirectional digital I/O (4×8-bit ports, can be combined as 8/16/32 bits)

Level: 5 V TTL/CMOS (non-isolated)

Rate: Maximum I/O rate for mode I/O is 2 MHz; maximum I/O rate for handshake is 1 MHz

Status: EOL (inventory / second-hand)

Driver： Traditional NI-DAQ (not NI-DAQmx)

II. Core Specifications (Easy to Understand)

✅ Channels and Performance

32 bidirectional DIO: 4 independent 8-bit ports, which can be software-configured as 8/16/32-bit groups

Level: 5 V TTL/CMOS (Input: 0.8 V low / 2 V high; Output: 24 mA / channel)

Maximum Rate:

Mode I/O (Pattern I/O): 2 MHz

Handshaking I/O (Handshaking): 1 MHz

Handshake Protocol: 6 timing sequences (including asynchronous / synchronous, strobe, response)

Trigger / Synchronization: RTSI bus (multi-card synchronization), star / start-stop trigger

?? Hardware and Electrical

Controller: NI DAQ-DIO ASIC (Integrated handshake, mode generation, counter)

Interface: MITE PCI bus master (DMA, burst transmission, low CPU usage)

Connector: 68-pin SCSI-II female connector (all 32 DIO + control / power)

Power-On State: Programmable (open circuit / pull-up / pull-down, 2.2 kΩ)

Power Supply: +5 V, 1.3 A (approximately 6.5 W)

Temperature: 0 °C ~ 55 °C (operating)

Size: 17.5 × 10.7 cm (6.9 × 4.2 in)

Isolation: ❌ No channel isolation (TTL direct connection, requires external isolation)

III. PCI-DIO-32 vs Alternative Models (Key Differences)

1) PCI-DIO-32 (6533, older model)

✅ 32 TTL, 2 MHz, RTSI, handshake / mode I/O

⚠️ End of Life, NI-DAQ, no isolation, only PCI, does not support PCIe

2) Direct Replacement: PCI-6534 (Upgrade version of PCI-DIO-32)

✅ 32 TTL, up to 4 MHz, stronger DMA, NI-DAQmx

✅ Supports PCIe (PCIe-6534), available for sale

✅ Compatible with old programs (easy porting)

3) Isolation Replacement: PCI-6527 (24-channel isolated DIO)

✅ 24-channel isolated (60 VDC), relay output, industrial anti-interference

⚠️ Rate low (≤1 kHz), not high-speed

IV. System Compatibility (Only legacy environment)

System: Windows 2000/XP/7 (32-bit), LabVIEW Real-Time (old version)

Not Supported: Win10/11 native, Linux, NI-DAQmx default, PCIe

Software: LabVIEW (≤2017), LabWindows/CVI, C/C++, VB6

V. Typical Applications (Only for old equipment maintenance / high-speed TTL)

High-speed digital signal acquisition / generation: TTL level, 2 MHz, timing control

Industrial equipment handshake communication: PLC / instrument 8/16/32-bit parallel data exchange

Old production line test bench: Replace the same faulty card to maintain high-speed I/O

Mode I/O Test: Synchronous output / input digital patterns (such as logic testing) VI. Common Questions

⚠️ PCIe cannot be used: Must use old-fashioned PCI slot; PCIe - 6534

⚠️ Driver compatibility required: Windows 10/11 needs compatibility mode. It is recommended to upgrade to the 6534 series

⚠️ No isolation: Industrial sites require external optocouplers / relays to avoid damage

VII. Recommended alternative models (mandatory)

PCI-6534: PCI, 32 channels TTL, 4 MHz, NI-DAQmx, in stock

PCIe-6534: PCIe ×1, 32 channels TTL, 4 MHz, native for Windows 10/11

PXI-6534: PXI bus version, suitable for chassis integration