This unique I/O Expansion Module provides simple, intelligent input/output control for transmitters and transceivers — extending system flexibility for monitoring, alerting, and automation applications.
Designed with four relay outputs and eight configurable I/O pins that can act as either inputs or open-drain outputs. This powerful module enables bidirectional control over serial or radio links and can be expanded further by daisy-chaining multiple 20-03 units.
Each input can trigger custom messages or commands, while outputs can be activated by POCSAG messages containing Salcom Relay Protocol commands or specific ASCII strings. This makes the 20-03 ideal for remote monitoring, telemetry, and alarm management applications.
Key Features:
- Onboard power and data LEDs provide clear operational feedback
- In built protection for inductive loads and resettable fuses
- Scalable way to add intelligence and control to your communication system
- Supports Salcom Relay Protocol and ASCII messaging, allowing easy integration into PC, PLC, or microcontroller systems
- Enables bidirectional control over serial or radio links