The Astronics/EADS/Talon Instruments SR112 is an 8-channel RS485 differential stimulus/response module engineered for industrial data transmission and reception over RS485 networks. Differential signaling delivers enhanced noise immunity in automation, control, and data acquisition systems. The module integrates into VXI chassis environments as part of larger stimulus/response test systems, supporting reliable bidirectional communication with RS-485 standard compliance.
## Technical Specifications
• **Channels**: 8 differential RS485 stimulus/response channels
• **Standard**: RS-485 compliant for balanced multipoint transmission
• **Data Rates**: Up to 25 MHz; 50 MHz in multiplexed mode
• **Timing Rates**: Up to 50 MHz
• **Channel Memory**: Up to 128 Kbits per channel, expandable to 256 Kbits in multiplexed mode
• **Memory Architecture**: Stimulus, Tristate, Record, Expect, and Mask
• **Input High Threshold**: Typically 2.0 V
• **Input Low Threshold**: Typically 0.8 V
• **Input Impedance**: >10 kΩ
• **Output High Level**: Typically >2.4 V
• **Output Low Level**: Typically <0.4 V
• **Source Current**: 50 mA
• **Sink Current**: 50 mA
• **Output Impedance**: 50 Ω
• **Short Circuit Protection**: Standard on outputs
## Key Features
• Differential RS485 signaling for superior noise rejection
• Stimulus generation and response capture on all 8 channels
• Voltage support: TTL levels, RS485/422, and variable ±15 V or +5 V/−2 V options
• Scalable memory per channel with multiplexed mode expansion
• Operates within VXI chassis framework
## Typical Applications
• Industrial automation and control systems
• Long-distance multipoint data acquisition
• RS485 network stimulus/response testing
• Noisy industrial environments requiring differential signaling
## Compatibility & Integration
The SR112 is designed for integration within VXI chassis housing. The SR192 Digital Test Module accommodates up to 12 I/O modules per chassis for 96 to 192 total channels. Multiple SR192 systems can be linked to reach 1152 channels within a single VXI chassis. Logic options include RS485/422, TTL, and ECL configurations.
