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UlJJ311 , . 1..~nD~r ALERT SYSTEM 585A/B Data Transmitter 548A/B Receiver Preliminary Information 585 A/B DATA TRANSMITTER . The HANDAR 585NB Dala Transmitler includes many features 01 significant benefit to ALERT System users. A- mong these features are 1200 baud data transmission to in. crease system capacity, error detection for eliminating .spurious. data, a low batlery warning to prevent data loss, and a synthesized VHF radio lor greater convenience in installation, maintenance and spares inventories. In addition. the S8SA/B is compatible wrth existing ALERT networks. . 300/1200 Baud. As systems grow and more sen. sors are added, the ability to choose a higher baud rate reduces the probability allosing a sensor report due to interference with another transmission on ths same frequency. A 1200 baud rale shortens the message length over 50%, thus allowing more sensor reports to be trans- mitted on the assigned ALERT frequency. For compatibility with existing 300 baud rale systems, the unit can be switched to the lower rale. Error Detection. Radio frequency interference may cause .spurious. dala 10 appear in ALERT data bases. Deleting this data takes many hours of scanning and editing. The error delec1ion mode eliminates garbled data . 300 or 1200 Baud High speed reduces data "hits. dua to inter- ference betweeen transmitters. Expands number of sensor repolls per frequency. Error Detection Eliminates .spurious. data to minimize time consuming editing 01 data base. Low Battery Warnlng!1nhlblt Warns user of potential loss 01 data. Pre- vents damage to batteries. Synthesized VHF Radio Mu~i-channel VHF radio can be used any- where in ALERT system. Minimizes spare parts inventory and speeds up availability 01 new at spare units. Expandable Analog Interface Allows sensor expansion lor multiple uses such as weather, airlwatet quality, etc. from cluttering the data base. low Ballerv Warnlna'lnhlblt. If batteries are low and are not replaced, or are not being provided an ade- quate recharge, data can be lost. A "Low Battery. message is received at the Base Station to give sufficient time to change or recharge batteries. In addition, operation is automatically inhibited if vo~age fans below a level which would permanent!y damage the batteries. Network Status Transmissions. In addition to battery voltage, information is sent to the Base Station to indicate if the data transmitter is operating properly. This is transmitted eve!)' 12 hours. or 255 transmissions. along with Ihe number 01 transmissions sent from the remole sile since the last status check. Svntheslzed VHF Radio. The HANDAR synthe- sized radio provides lor hardware switching of all available radio channels without crystal changing. Spare parts in- ventories are red;Jced since one mu~i-channe' dala trans- mitler can be used anywhere in a system. Long lead time for spares is significantly reduced.