The RadiSys EXM-7 is a 16-bit expansion module that adds two RS-232 serial ports to embedded PC systems. Designed for the EXM expansion interface standard, it delivers reliable serial communication through dual DB-9 connectors, typically configured as COM3 and COM4. The card operates on ISA bus electrical principles, ensuring broad compatibility with PC-based software and supporting up to eight expansion modules per embedded PC.
Technical Specifications
Serial Interfaces
• 2 × RS-232 serial ports with standard male DB-9 connectors
• Supports up to 14400 baud operation
• Standard 8 data bits, no parity, one stop bit (8, N, 1) configuration
Electrical Characteristics
• 5 V @ 0.3 A
• +12 V @ 0.1 A
• −12 V @ 0.1 A
• 16-bit data transfer interface with EPC modules
• ISA bus electrical compatibility
Addressing and Interrupts
• Responds to I/O addresses 100h, 102h, and 103h for module identification
• EXMID signal enables module response
• Configurable I/O base addresses: 3E8h (COM3) and 2E8h (COM4)
• Configurable interrupt request lines (e.g., IRQ9 for Port A, IRQ5 for Port B)
• Standard PC COM port interrupt handling compatibility
Physical Characteristics
• EXM module form factor
• Weight: 0.02 lbs
– Key Features
• IBM PC architecture serial port compatibility
• Modular design supports up to 8 expansion cards per system
• Dual independent RS-232 channels with discrete interrupt configuration
• Low power consumption across all supply rails
• Standard PC software support for COM port operations
– Typical Applications
The EXM-7 extends serial connectivity in embedded PC systems requiring additional COM ports beyond the native two channels, enabling multi-port serial data acquisition, device control, and legacy equipment integration in industrial and embedded computing environments.
– Compatibility & Integration
Full compatibility with IBM PC serial port architecture and standard Windows/DOS COM port drivers. Integrates into RadiSys embedded PC platforms supporting the EXM expansion interface across VME, VXI, and EMC form factors.
