| 摘要 |
Control apparatus for an environmental data system of the type which continuously records the output of one or more field located environmental sensors, and which also counts and compares the output with a threshold magnitude. When the threshold magnitude is exceeded, an alarm signal is generated which establishes a communication link with a remote central control station. The control apparatus provides a single complete pulse from a clock at a first output terminal when the communication link is established, to transfer the count to a shift register, and subsequent pulses from the clock are provided at a second output terminal, to clock the data from the shift register. |
