Comprehensive Product Summary: TB‑6221‑01 Multiplexer Switch Board (for PXI‑7921)

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### 1. Product Overview

Product Name: Multiplexer Switch Board 62‑Pin D‑Sub (without cable)
Model: TB‑6221‑01
Article Number: TB‑6221‑01
Series: PXI Switch Accessories
Manufacturer: ADLINK Technology Inc.
Associated Module: PXI‑7921, 24‑Channel 2‑Wire Multiplexer DPDT Relay Module

The TB‑6221‑01 is a dedicated multiplexer switch termination board designed for use with ADLINK’s PXI‑7921 relay multiplexer module. It provides a convenient interface between the PXI‑7921’s 62‑pin D‑Sub male connector and external wiring through screw terminals. The board enables flexible signal routing for 1‑wire, 2‑wire, and 4‑wire multiplexer configurations without requiring additional jumper settings.

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### 2. Key Features

- Purpose‑built for PXI‑7921: Provides direct connection to the PXI‑7921’s 62‑pin D‑Sub male I/O connector.
- Multiple Multiplexer Configurations: Supports 48×1 1‑wire, 24×1 2‑wire, 12×1 4‑wire, two 12×1 2‑wire, or four 6×1 2‑wire configurations.
- High‑Density Connectivity: Accommodates up to 24 DPDT (2 Form C) relay channels through a single 62‑pin interface.
- Screw‑Terminal Interface: Simplifies field wiring and reconfiguration for laboratory and industrial applications.
- Software‑Selectable Switching: All channel configurations are controlled via software through the PXI‑7921 module.
- Safety and Reliability: Designed for safety‑critical applications with support for emergency shutdown and watchdog timer functions through the PXI‑7921.
- PXI System Integration: Fully compatible with PXI specifications Rev. 2.2 and CompactPCI (PICMG 2.0 R3.0).
- Hot‑Swap Support: When used with PXI‑7921, supports CompactPCI Hot‑Swap (PICMG 2.1 R2.0).
- Deterministic Scanning: Enables deterministic relay sequencing through the PXI‑7921’s onboard 1 k‑sample scan list.
- Synchronization: Supports PXI trigger bus and star trigger synchronization for multi‑module systems.

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### 3. Technical Specifications

Physical Characteristics (PXI‑7921 Module):
- Form Factor: 3U Eurocard, CompactPCI compliant
- Dimensions: 160 mm (L) × 100 mm (H) (excluding connectors)
- Connector Type: 62‑pin D‑Sub male (module) / 62‑pin D‑Sub female (TB‑6221‑01)
- Operating Temperature: 0 °C to 55 °C
- Storage Temperature: −20 °C to 70 °C
- Relative Humidity: 5 % to 85 % non‑condensing
- Power Requirements (all relays ON):
- +5 V @ 1 A
- +3.3 V @ 400 mA

Relay Characteristics (PXI‑7921):
- Number of Channels: 24 (2‑wire)
- Relay Type: DPDT (2 Form C), non‑latching
- Max. Switching Current: 2 A
- Max. Carrying Current: 2 A
- Max. Switching Voltage: 220 V DC / 125 V AC
- Max. Switching Power: 60 W / 50 VA
- Contact Resistance: ≤ 100 mΩ
- Operate Time: ≤ 4 ms
- Release Time: ≤ 4 ms
- Bounce Time: ≤ 1 ms
- Mechanical Life: ≥ 10⁸ operations
- Electrical Life: ≥ 5 × 10⁵ operations (1 A @ 30 V DC, resistive load)

Electrical Interface:
- Logic Level: 3.3 V TTL (5 V tolerant)
- Handshaking Signals: TRG_IN, S_ADV, PXI trigger bus, PXI star trigger
- Safety Inputs: SHDNn (emergency shutdown), watchdog timer overflow

TB‑6221‑01 Board Interface:
- Connector: 62‑pin D‑Sub female
- Termination: Screw terminals for all signal lines
- Default Configuration: 2‑wire mode (reconfigurable via software)
- Cable Compatibility: ACL‑10262 (62‑pin D‑Sub male/female cable, 1 m)

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### 4. Functionality

The TB‑6221‑01 serves as the termination and wiring interface for the PXI‑7921 multiplexer module. The PXI‑7921 uses 24 DPDT relays to route signals between a single measurement instrument (such as a DMM, digitizer, or signal source) and multiple test points.

Operating Modes:
- Direct‑Update Mode: Relays switch immediately upon software command.
- Auto‑Scan Mode: Relay patterns are sequenced automatically from a 1 k‑sample onboard scan list, triggered by external devices or internal timers.

Use Cases:
- Automated test systems (ATE)
- Laboratory instrumentation switching
- Industrial process control and monitoring
- Signal routing for data acquisition systems
- Safety‑critical relay control with watchdog and emergency shutdown

Compatibility:
- PXI‑7921 module (required)
- PXI chassis compliant with PXI Rev. 2.2 / CompactPCI R3.0
- Operating systems: Windows 2000/XP/Vista/2003
- Supported software: VB, VC++, BCB, Delphi, DAQBench
- Driver: ADL‑SWITCH for Windows

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### 5. Components & Accessories

Included Items (PXI‑7921 Package):
- PXI‑7921 24‑CH Multiplexer DPDT Relay Module
- User’s Manual (Part No. 50‑17011‑100)
- ADLINK Software CD (includes ADL‑SWITCH driver and utilities)
- ADL‑SWITCH User’s Guide

Optional Accessories:
- TB‑6221‑01: Multiplexer Switch Terminal Board (62‑pin D‑Sub female)
- ACL‑10262: 62‑pin D‑Sub male/female cable, 1 m length

Connectors and Signals (PXI‑7921 CN1):
- +5 V OUT, GND
- CH0 – CH23 (±) channel pairs
- COM0 – COM3 (±) common terminals
- TRG_IN (Trigger Input)
- S_ADV (Scanner Advanced Output)
- SHDNn (Emergency Shutdown Input)
- 1WireLoRef (reference for 1‑wire mode)

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### 6. Installation & Setup

Requirements:
- PXI chassis with available 3U peripheral slot
- Compatible PXI controller or embedded PC
- Anti‑static handling precautions

Installation Steps:
1. Power off the PXI chassis before inserting the module.
2. Align the PXI‑7921 with the chassis card guide and slide it into the slot.
3. Push the ejector handle upward until the module clicks into place.
4. Secure the front‑panel screws.
5. Attach the TB‑6221‑01 terminal board to the front 62‑pin connector using the ACL‑10262 cable or direct connection.
6. Connect external wiring to the TB‑6221‑01 screw terminals according to the desired multiplexer configuration.

Hot‑Swap Capability:
- Supported under CompactPCI Hot‑Swap (PICMG 2.1 R2.0).
- Microsoft Embedded XP supports native hot‑swap; other OSs may require additional drivers.

Configuration:
- All relay configurations and scan lists are software‑defined.
- Use ADL‑SWITCH utilities to set up scan lists, trigger sources, and safety parameters.

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### 7. Performance & Capabilities

Switching Performance:
- 125 operations per second typical
- Deterministic scanning via 1 k‑sample onboard memory
- Programmable debounce and scan‑delay timers

Capacity & Efficiency:
- Supports up to 48 signal paths (1‑wire) or 24 (2‑wire) channels
- 2 A max current per channel, 220 V DC / 125 V AC max voltage
- Low contact resistance ensures minimal signal loss

Synchronization & Triggering:
- PXI trigger bus and star trigger for multi‑module synchronization
- Programmable polarity and logic levels for TRG_IN and S_ADV
- Handshaking with external instruments (e.g., DMMs) for coordinated measurement cycles

Safety & Reliability:
- Emergency shutdown input (active low, 3.3 V TTL)
- Watchdog timer (32‑bit counter, 10 MHz base clock)
- Programmable relay safety states on fault or timeout
- Mechanical endurance ≥ 10⁸ operations

Limitations:
- Non‑latching relays (requires continuous power to maintain state)
- Operating temperature limited to 55 °C
- Not intended for high‑frequency RF switching

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### 8. Standards & Compliance

- PXI Specification: Rev. 2.2 compliant
- CompactPCI Compliance: PICMG 2.0 R3.0
- Hot‑Swap Compliance: PICMG 2.1 R2.0
- EMC/EMI: CE and FCC Class A certified
- Environmental: Designed for 5 %–85 % RH non‑condensing operation
- Safety: Supports programmable emergency shutdown and watchdog timer for safety‑critical systems

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### 9. Additional Information

Warranty:
- Standard 2‑year manufacturer’s warranty from ADLINK Technology Inc.
- Covers defects in materials and workmanship under normal use.
- Excludes damage from misuse, improper installation, or environmental factors.
- RMA service available via ADLINK’s online portal (http://rma.adlinktech.com/policy).

Support & Maintenance:
- Technical support: service@adlinktech.com
- Telephone: +886‑2‑82265877
- Fax: +886‑2‑82265717
- Address: 9F, No. 166, Jian Yi Road, Chungho City, Taipei 235, Taiwan
- Website: [www.adlinktech.com](http://www.adlinktech.com)

Software & Updates:
- ADL‑SWITCH driver package for Windows 98/ME/NT/2000/XP/Vista/2003
- Includes test utilities, sample code (VB, VC++, Delphi, BCB), and DAQBench integration
- Firmware and driver updates available from ADLINK’s website

Maintenance Recommendations:
- Operate within specified temperature and humidity ranges.
- Avoid mechanical shock or vibration beyond PXI specifications.
- Periodically inspect connectors and terminal screws for secure contact.
- Replace relays only with manufacturer‑approved components if required.

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### Summary

The ADLINK TB‑6221‑01 Multiplexer Switch Board is a precision termination accessory engineered for the PXI‑7921 24‑Channel 2‑Wire Multiplexer Module. Together, they form a versatile, software‑programmable switching solution for automated test and measurement systems. The PXI‑7921 provides high‑density relay switching with deterministic scan control, while the TB‑6221‑01 offers a robust, user‑friendly interface for wiring and configuration.

With compliance to PXI Rev. 2.2 and CompactPCI R3.0 standards, support for PXI trigger synchronization, and integrated safety mechanisms such as watchdog timers and emergency shutdown, the TB‑6221‑01/PXI‑7921 combination delivers reliable performance in laboratory automation, industrial control, and safety‑critical applications.

ADLINK’s comprehensive software support, long‑life relay design, and adherence to international EMC and safety standards make this product pair a dependable choice for engineers seeking flexible, high‑performance signal switching within PXI‑based test environments.