Omega OM-CP-RF Series User Manual

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Omega OM-CP-RF Series User Manual Manual pdf 4 page image

OM-CP-RF Series Operations ManualOmega Engineering, Inc. Revised 04/07/05 Page 2 of 18Omega Engineering, Inc.Operations Manual for OM-CP-RF Series Data LoggersINTRODUCTIONOmegaís OM-CP-RF series line of wireless-enabled data loggers provides a simple, low-cost wireless solution for short-range data collection applications. These products arepowered by a user-replaceable internal battery and can be configured for up to ten years ofbattery life. They are designed for one-way, low data-rate applications, and transmit real-time data directly to a PC for monitoring. Like Omegaís standard series of data loggers, theyare simple to use and their versatile configuration options allow for easy integration into awide variety of applications. The product line includes models for all the most popularcommercial and industrial measurements, as shown in this table:PRODUCT DESCRIPTIONOM-CP-RFTemp101A Temperature Recorder and Wireless TransmitterOM-CP-RFRHTemp101A Humidity / Temperature Recorder and Wireless TransmitterOM-CP-RFTC4000A Thermocouple Temperature Recorder and Wireless TransmitterOM-CP-RFRTDTemp101A RTD Temperature Recorder and Wireless TransmitterOM-CP-RFpHTemp101A pH / Temperature Recorder and Wireless TransmitterOM-CP-RFVolt101A DC Voltage Recorder and Wireless TransmitterOM-CP-RFProcess101A DC Current Recorder and Wireless TransmitterOM-CP-RFPulse101A Pulse Recorder and Wireless TransmitterThese products have onboard memory in addition to the wireless transmitter, so theycan completely replace existing data loggers and strip chart recorders while providing anadded wireless data link. This memory can also serve as a failsafe backup, in the event ofinterference in the wireless channel or interruption of service to the monitoring computer.TRANSMITTER CHARACTERISTICSThe transmitter used in the OM-CP-RF series products is a carrier present-carrier absent(CPCA) amplitude-modulated (AM) signal operating at a carrier frequency of 418 MHz. Thedata being transmitted is encoded similarly to standard RS232 serial data at a bit rate of4,800 baud. This signal is detected by the RFC101A receiver module and converted toRS232 signals, which are passed to the COM port of the monitoring PC.The transmitter type and encoding method permit the device to use the maximumallowable output power specified by the FCC, and also minimizes the amount of batterypower required for the transmission. This gives the user the best possible range, and alsoensures a long battery life.To conform to FCC Part 15.231 rules, the data transmission takes less than one secondand the minimum periodic transmission rate allowed by the device is 30 seconds. The lowduty cycle permits several devices to use the same communication band and receiverwithout excessive interference caused by ìtalking overî each other.