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The device provides 4 digital inputs for recording specific asynchronous events and 2 digital outputs for controlling specific devices. When not within range of a GSM network device the FD420-GSM can log up to 32,000 points of tracking information for later retrieval using non-volatile circular buffer memory.
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The unit is suitable for connection to either a 12VDC or 24VDC system. CONNECTING THE ANTENNAS The supplied GPS antenna must be connected to the FD420-GSM correctly in order to obtain a valid satellite fix. The following must be considered when connecting the antenna.