Abaco Systems / SBS / Greenspring IP-UNIDIG-I-D 24 Differential I/O IndustryPack Module

The IP-UNIDIG-I-D is a single-wide IndustryPack module delivering 24 differential digital I/O channels for industrial data acquisition and control systems. Each channel configures independently as input or output, with double-buffered outputs and programmable interrupt capability on any input line. The module supports Master/Slave synchronization across multiple IndustryPacks and meets EIA-422 and EIA-485 differential signaling standards with extended common-mode range.

Technical Specifications

Digital I/O Architecture

• 24 differential channels, individually programmable as input or output


• Double-buffered outputs with optional input/output double-buffering for simulation compatibility


• External clock triggers with selectable polarity for buffer synchronization


• Any input line capable of generating interrupts


• Master/Slave mode: Master unit drives external clock source to I/O line 23; Slave units receive synchronization clock on I/O line 24


• Reset disables output drivers and double-buffering for consistent software state Electrical Performance


• Input voltage range: +15 V / -5 V maximum


• Common-mode range: +12 V to -7 V (EIA-422/EIA-485 extended spec)


• Logic threshold: 1.25 V for direct CMOS/TTL compatibility


• Output sink current: 64 mA continuous per channel


• Output control: 24-bit register; writing "0" enables driver, "1" places line in high-Z state (power-up default)


• Termination: Socketed resistors across differential pairs; 100 Ω factory default, user-configurable

Key Features

• EIA-422 and EIA-485 differential input compliance with extended common-mode immunity


• Per-channel output driver gating via dedicated control register


• Synchronization primitives for multi-module timing coherence


• TTL-level input threshold for legacy system integration


• Factory-installed 100 Ω termination resistors; user-replaceable socketed design

Typical Applications Multi-channel differential signal acquisition in industrial control, motor drive feedback, sensor interfacing, and real-time simulation environments requiring phase-locked I/O across distributed modules.

Compatibility & Integration Supported by Windows NT driver software and subroutine library. Single-wide IndustryPack form factor for mezzanine carrier board integration.