I got the impression that stand-alone XBee modules can be used as sensors (transmitting Analog/Digital input values to another XBee) and actuators (driving digital out HIGH/LOW according to commands it receives from another XBee). I am planning to use several standalone XBee modules as sensor/actuator slaves and one master XBee connected to an Arduino. Stand-alone means here that XBees are not phycially connected to MCUs. Analog/Digital inputs are connected to sensors and digital outs drive relays
Do all Xbee modules support this kind of sensor/actuator functionality, or should I pick up some spesific models?
Actually, the XBee module is not a sensor, but, if a sensor supplies it a value, the Xbee can transmit it. Similarly, if a Xbee receives a value, it can set an output pin HIGH or LOW.
The Series 2 radios were designed for some different purpose. Exactly what that purpose was, or how to accomplish that goal, escapes me.
Both series 1 and 2 radios support I/O samples (receive i/o data from standalone xbee) and remote at (turn off/on pins on remote standalone xbee) but series 1 would be a better choice.