Emerald-MM-4M-XT Diamond Systems 4-Port RS-232 and 48 Digital I/O PC/104 Module

The Diamond Systems Emerald-MM 4-Port PC/104 Serial Module two-in-one concept of Emerald-MM-DIO saves critical space for users with limited stack height in their enclosures. The 4 RS-232 ports feature a full set of 8 signals and are based on the 16C554 UART for compatibility with almost all embedded operating systems. Eight address combinations and eleven interrupt levels are provided for configuration flexibility.

The 48 digital I/O lines are organized into 6 8-bit ports. Output current is 0.3mA in high state and 8mA in low state. Emerald-MM-DIO uses inverting logic on the DIO lines. Port direction is programmable bit by bit: When a 0 is written to any bit, its output is tri-stated and pulled high by a 10K? resistor, indicating a logic 1 and enabling it to also be used as an input. When a 1 is written to a bit, its output is driven low indicating a logic 0. Input data is also inverted, so readback of output ports matches the written data.

Emerald-MM-DIO features edge detection capability on 24 DIO lines. You can enable or disable edge detection and select high or low edge on each bit independently. When any specified edge occurs, an interrupt will be generated. Edge detection is fully supported by our Universal Driver software, letting you run your own custom code whenever a change of state occurs. This powerful feature can be used for security and safety applications, pattern matching, and more.