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Redwood City Potice <br /> Department System Description <br /> ,.. <br /> � on the size of the message. The maximum message size for the <br /> RDLAP protocol is 4,000 bytes. The VRM's outbound message <br /> storage buffer is 16K bytes. If the buffer becomes full no new <br /> messages will be accepted and all new messages will be NAcked. <br /> Features and Specifications <br /> Advanced Electronic Design <br /> The VRM 650 design reflects the state-of-the-art in radio data <br /> communications. The CPU is Motorola's 68HC I 1 <br /> microcontroller. Motorola's 56156 Digital Signal Processor(DSP) <br /> chip handles all data modulation and demodulation tasks. <br /> Together with its onboard Flash EEPROM,the processing power <br /> of the VRM provides flexibility and simple upgradeability as <br /> application aad system needs change. <br /> DTE Interface Port _ <br /> The VRM 650 may be interfaced to any intelligent DTE device via <br /> a 9 pin D type female connector: The signal levels aze per <br /> RS232C. The following signal lines are available: <br /> . DCD Data Cazrier Detect <br /> . R�Receive Data. <br /> . 'I'XD Transmit Data <br /> . DTR Data Tezminal Ready <br /> . DSR Data Send Ready <br /> . RTS Request To Send _ <br /> . CTS Clear To Send <br /> . RI Ring Indicator <br /> . GND Signal Ground <br /> As an interface altemative,tlus same logicai port is also available <br /> through an 8 pin rectangulaz connector at CMOS levels. However, <br /> neither DCD or RI are available on this connector. <br /> �MOTOROLA , ' Z - 11 <br /> _ . _ _ __. _ <br />