This radio modem is for pakbus networks with uhfvhf radios. The versatile rf500m can serve as a field modem connected to a pakbus datalogger, as a standalone repeater not connected to a datalogger, or as a base-station modem connected to a computer. It works with our rf310-series radios, our rf300-series radios, or any radio and modem combination that outputs a demodulated byte stream via rs-232. The rf500m uses software (i.e., devconfig) instead of hardware modifications to upgrade the operating system (os) and change rf id or other settings. features supports multiple radio configurations compatible with pakbus dataloggers (e.g., cr800, cr850, cr1000, cr3000, cr10x-pb, cr510-pb, cr23x-pb) uses software (i.e., devconfig) instead of hardware modifications to upgrade the operating system (os) and change rf id or other settings provides an rs-232 port (dte) for modem configuration or attachment of an rs-232 radio avoids all collisions within a network, thus increasing polling speeds and reducing overall current drain specifications voltage: 7 to 20 vdc current drain: