Model: PCI‑6602

Part Number: 777531‑01

Brand: National Instruments (NI)

Type: 8-channel 32-bit high-speed counter/timer + 32-channel static DIO

Bus: Standard PCI (5 V, half-length card)

Connector: 1×68-pin SCSI (female) + RTSI synchronous port

Driver: NI‑DAQmx

Applications: High-frequency counting, encoders, frequency/period/pulse width, pulse string generation, multi-channel synchronization, industrial automation/ATE

Core Overview

The PCI‑6602 is a high-performance upgrade of PCI‑6601, providing 8 independent 32-bit add/subtract counters (1 times more than 6601), up to 80 MHz clock, 3 DMA channels, and integrates 32 5 V TTL/CMOS static DIO with Schmitt trigger, digital de-joicing, pre-dividing, suitable for multi-channel high-speed timing, precise measurement, motion control, and pulse generation scenarios.

Main Specifications

Counter channels: 8 channels (32-bit, add/subtract counting) NI

DIO channels: 32 bidirectional, 5 V TTL/CMOS (4×8-bit ports) NI

Counter clock source:

Internal: 100 kHz, 20 MHz, 80 MHz (high precision)

External: Up to 80 MHz (directly) / 125 MHz (×8 prescaler)

Prescaler: Each channel can be selected as ×2 or ×8

Maximum count value: 2³² - 1 = 4,294,967,295 NI

DIO levels (TTL/CMOS)

Input low ≤ 0.8 V; Input high ≥ 2.0 V

Output low ≤ 0.4 V (sinking 24 mA); Output high ≥ 2.4 V (pulling 24 mA)

Trigger / Synchronization: RTSI, external trigger, gating, output synchronization

DMA: 3 high-speed DMA channels (simultaneous transmission)

Power supply: +5 V @ 0.5–1.5 ANI

Operating temperature: 0 ~ 55 °C NI

Features: Schmitt trigger (300 mV hysteresis), software de-joystick, power-on high-impedance weak pull-down NI Typical application

Multi-axis encoder position/velocity measurement (servo/stepper motor)

High-frequency event counting, output/flow/pulse accumulation

Precise frequency, period, pulse width, duty cycle measurement

Pulse/ripple/sequence generation (trigger, synchronization, control)

Industrial I/O monitoring, relay driving, sensor interface

ATE automated testing, timing verification, synchronous control

PCI-6602 User Manual (Chinese Version - Simplified Operation)

1. Hardware Installation

Power-off operation: Shut down the PC and unplug the power cord.

Insert card: Insert PCI-6602 into the 5 V PCI slot and tighten the retaining screw.

Cabling:

Use SH68-68-D1/E1 shielded cable to connect the 68-pin SCSI port

Counter signals: CI0–CI7 (input), CO0–CO7 (output)

DIO: D0–D31 (bidirectional)

RTSI: Synchronize other NI boards (such as DAQ, motion control)

Power/ground: +5 V, GND (connector power supply ≤ 1 A)

2. Driver and software installation

Install NI-DAQmx (required, recommended latest version)

Open NI MAX (Measurement & Automation Explorer)

Find PCI-6602 under "Devices and Interfaces"

Right-click for self-check, "Passed" indicates normal hardware

Development environment: LabVIEW, C/C++, Python, VB (DAQmx API)

3. Common configuration of counter (DAQmx)

Working mode: Event counting, frequency, period, pulse width, encoder (A/B/Z), pulse generation, pulse string

Clock source: Prefer 80 MHz internal (high precision); Use ×8 predivider for high-frequency external signals

Predivider: Input > 80 MHz must use ×8 (up to 125 MHz)

De-icing: Software setting (filter ≤ 1 μs spikes)

Count direction: Add/Subtract; Encoder A/B phase automatically determines direction

DMA: Enable DMA for high-speed acquisition (reduce CPU usage)

4. Digital I/O operations

Direction configuration: Set 8-bit port as input/output

Read/write mode: Static read/write (no handshake), suitable for low-speed control

Power-on state: Input high impedance, weak pull-down (avoid false triggering) NI

5. Key precautions

Level matching: Only supports 5 V TTL/CMOS,严禁 connecting ±12 V/24 V

Common ground： Equipment and the measured object must be grounded to reduce noise

Output load： ≤ 24 mA per channel， avoid short circuit

High-frequency signal： > 1 MHz use shielded line， length ≤ 2 m

Heat dissipation： Ensure cabinet ventilation for 80 MHz long-term full load

6. Common problems

Cannot find device： Replace 5 V PCI slot， reinstall DAQmx， refresh MAX

Counting error： Check common ground， de-icing， predivider， signal level

Trigger anomaly： Confirm trigger source， polarity， level， RTSI connection

PCI-6602 vs PCI-6601 (Selection Overview) Table

Project PCI‑6602 PCI‑6601

Counter 8 channels 4 channels

Highest clock 80 MHz (125 MHz pre-divided) 20 MHz (60 MHz pre-divided)

DMA 3 channels 1 channel

DIO 32 channels 32 channels

Power consumption 0.5–1.5 A 0.4–0.75 A

Price Higher Lower

ApplicableFor multi-channel, high-frequency, precise timingFor basic counting, low-speed pulses