Eurotech AIM104-MULTI-IO-R6 8 Channel RS232 PC/104 Board

The Eurotech AIM104-MULTI-IO-R6 is a PC/104 form factor board that combines eight opto-isolated RS232 serial channels with analog and digital I/O in a single module. Designed for embedded industrial systems, it delivers 1000V electrical isolation between the PC/104 host and external circuits, protecting against transient events and ground loops. The board operates from -20°C to +70°C and draws maximum 480mA at +5V DC, making it suitable for distributed control architectures and data acquisition in noise-prone environments.

## Technical Specifications

**Serial Communication**
• 8× RS232 channels (16C550-compatible, asynchronous)
• Opto-isolated architecture

**Analog Inputs**
• 16 single-ended or 8 differential channels (jumper-selectable)
• 12-bit resolution
• Input range: -5V to +5V (bipolar)
• Conversion time: 500 µsec/channel
• Input impedance: 10MΩ // 10pF (typical)
• Relative accuracy: ±2 LSB (-5V to +5V)
• Gain error: 0.5% (typical), ±0.5% (maximum, -20°C to +70°C)

**Analog Outputs**
• 2 channels, 12-bit resolution
• Output modes: 0–25mA (current loop) or -5V to +5V (voltage bipolar)
• Channel update time: 320 µsec/channel
• Output impedance (voltage): <10Ω (typical)
• Calibration accuracy: ±2 LSB maximum (REF=5.0V)
• Integral non-linearity: ±3.5 LSB (maximum)
• Gain error: 0.35% (typical, -20°C to +70°C)

**Digital Inputs**
• 8 opto-isolated channels
• Switching voltage range: 10V to 30V
• Maximum input frequency: 50Hz
• 10ms fixed debounce filter
• Reverse input protection diodes included

**Electrical & Environmental**
• Power: +5V DC ±5%, maximum 480mA
• Operating temperature: -20°C to +70°C
• Isolation: 1000V (PC/104 to external), 30V (between adjacent channels)
• MTBF: 267,320 hours (MIL-HDBK-217F ground benign)

## Key Features

• PC/104 (IEEE996) form factor with 8-bit bus interface
• Independent opto-isolation on all serial and digital channels
• Flexible analog input configuration for single-ended or differential measurements
• Dual 12-bit DACs supporting both voltage and current loop output modes
• High input impedance for minimal signal loading
• Fixed 10ms debounce on digital inputs eliminates contact chatter

## Typical Applications

• Industrial process control and monitoring
• Distributed data acquisition in electrically noisy plants
• Legacy RS232 device integration in embedded Linux/Windows systems
• Multi-channel sensor interfacing with galvanic isolation

## Compatibility & Integration

PC/104 stacking bus interface; 5V single-supply operation; standard connector-based external I/O.