Omega OM-CP-RF Series, Руководство пользователя

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OM-CP-RF Series Operations Manual
Omega Engineering, Inc. Revised 04/07/05 Page 2 of 18
Omega Engineering, Inc.
Operations Manual for OM-CP-RF Series Data Loggers
INTRODUCTION
Omega’s 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 are
powered by a user-replaceable internal battery and can be configured for up to ten years of
battery life. They are designed for one-way, low data-rate applications, and transmit real-
time data directly to a PC for monitoring. Like Omega’s standard series of data loggers, they
are simple to use and their versatile configuration options allow for easy integration into a
wide variety of applications. The product line includes models for all the most popular
commercial and industrial measurements, as shown in this table:
PRODUCT DESCRIPTION
OM-CP-RFTemp101A
Temperature Recorder and Wireless Transmitter
OM-CP-RFRHTemp101A Humidity / Temperature Recorder and Wireless Transmitter
OM-CP-RFTC4000A Thermocouple Temperature Recorder and Wireless Transmitter
OM-CP-RFRTDTemp101A RTD Temperature Recorder and Wireless Transmitter
OM-CP-RFpHTemp101A pH / Temperature Recorder and Wireless Transmitter
OM-CP-RFVolt101A DC Voltage Recorder and Wireless Transmitter
OM-CP-RFProcess101A DC Current Recorder and Wireless Transmitter
OM-CP-RFPulse101A Pulse Recorder and Wireless Transmitter
These products have onboard memory in addition to the wireless transmitter, so they
can completely replace existing data loggers and strip chart recorders while providing an
added wireless data link. This memory can also serve as a failsafe backup, in the event of
interference in the wireless channel or interruption of service to the monitoring computer.
TRANSMITTER CHARACTERISTICS
The 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. The
data being transmitted is encoded similarly to standard RS232 serial data at a bit rate of
4,800 baud. This signal is detected by the RFC101A receiver module and converted to
RS232 signals, which are passed to the COM port of the monitoring PC.
The transmitter type and encoding method permit the device to use the maximum
allowable output power specified by the FCC, and also minimizes the amount of battery
power required for the transmission. This gives the user the best possible range, and also
ensures a long battery life.
To conform to FCC Part 15.231 rules, the data transmission takes less than one second
and the minimum periodic transmission rate allowed by the device is 30 seconds. The low
duty cycle permits several devices to use the same communication band and receiver
without excessive interference caused by “talking over” each other.