2.1.2
Summary Description
The NEXSYS RS232/RS422 Transceiver Module is a standalone, bidirectional device designed to interface with the NEXSYS LYNK Integrated Signal Processor (ISP) for seamless data exchange, robust signal integrity, and exceptional reliability in demanding aviation environments. The module can transmit and receive signals between RS232 and RS422 data buses, supporting protocol communication at data rates from 2,400 bps to 115.2 kbps.
Engineered to meet rigorous avionics standards, this high-reliability transceiver preserves signal integrity and ensures consistent performance under extreme conditions, complying with MIL-PRF-22885/116 and RTCA/DO-160G specifications. With a propagation delay of less than 1.6 μs, it delivers reliable, industry-leading signal performance and precise speed matching, making it ideal for integration into time-sensitive aviation systems.
Standard Characteristics
Designed for reliable operation in demanding aerospace environments with the following interface options.
28V: Operating voltage (nom.), 8 mA current draw (max.)
GND: Dedicated ground connection required for stable operation
RS232 RX: Receive connection
RS232 TX: Transmit connection
RS422 RX(+): Receive, positive connection (differential)
RS422 RX(-): Receive, negative connection (differential)
RS422 TX(+): Transmit, positive connection (differential)
RS422 TX(-): Transmit, negative connection (differential)
Configuration Options
Engineered to interface with NEXSYS product lines, the module uses a 22-pin CTS connector and supports direct integration with NEXSYS Component Technology devices and especially NEXSYS LYNK Integrated Signal Processors (ISP).
RS232 Characteristics: Industry-standard (EIA/TIA-232-E) RS232 interface specifications.
| Characteristic | Conditions | Minimum | Nominal | Maximum |
|---|---|---|---|---|
| Input Resistance | Operation | 3kΩ | 5kΩ | 7kΩ |
| Input Resistance | Input power = 0V | 6kΩ | 11kΩ | 16kΩ |
| Input Hysteresis | - | - | 0.5V | - |
| Output Voltage Swing | - | - | ±5V | ±5.5V |
| Output Short-Circuit Current | RS232 TX = Ground | - | ±30 mA | ±60 mA |
| Data Rate | RL = 3kΩ, CL = 1000pF | 2400 bps | - | 115.2 kbps |
| Cable Length | - | - | - | 30m/100ft |
RS422 Characteristics: Industry-standard RS422 interface specifications.
| Characteristic | Conditions | Minimum | Nominal | Maximum |
|---|---|---|---|---|
| Input Resistance | -7V < VCM < +12V | 96kΩ | - | - |
| Input Hysteresis | - | - | 30 mV | - |
| Output Voltage Swing | - | ±5V | ±5.5V | - |
| Output Short-Circuit Current | RS232 TX = Ground | ±30 mA | ±60 mA | |
| RTS | Voltage Input High (VIH) | 2.4V | - | - |
| Voltage Input Low (VIL) | - | - | 0.8V | |
| Differential Output Voltage (VOD) | R=50Ω (RS-422) | 2 | - | - |
| Data Rate | RL = 3kΩ, CL = 1000pF | 2400 bps | - | 115.2 kbps |
| Cable Length | - | - | - | 30m/100ft |
2.1.2.1
| Description | Parameters |
| Operating Parameters | |
| Operating Voltage (Max./Nom./ Min.) | +32 VDC /+28 VDC/+18 VDC |
| Power Supply Input Current | 50 mA (Maximum) |
| Hold Up Time from Power Loss at 25°C | 200 ms (Minimum) |
| Temperature | |
| Operating Temperature | -55°C to +85°C |
| Non-Operating Temperature | -55°C to +125°C |
| Reliability MIL-HDBK-217F, Notice 2 |
|
| Airborne Inhabited Cargo (AIC) at +40°C Continuous Operation |
100,000 hrs (Minimum) |
For Qualification Summary, see Appendix A.