The Q-Node is a microprocessor based central polling controller Buss interface. The Q-Node drives the Multiplex loop, and communicates with the modules along the buss. It communicates with the master controller through RS-485 serial port communication. The Q-Node sends commands to, and receives data from, the ID modules. In turn, it sends the data to, and receives commands from the System 3505 Prism LX. Up to 32 Q-Nodes may be installed in one system. Total wire run from the System 3505 Prism LX to the last Q-Node is 5,000 ft. with 18 AWG. The Q-Node can be set to any address from 1-32. The address is stored internally in an EEPROM. It is shipped pre-programmed to address #1. The field should reserve address #1 for use on the last Q-Node.