| 摘要 |
PURPOSE:To simplify constitution by processing all selective calling functions of the order circuit in a form of pulses. CONSTITUTION:Several frames of call signal 2-4 where the parity check code is added to the address code are inserted into signal 2-3 on a basis of signal 2-4. When local switch TLK is closed, circuits 3-7, 3-1 and 3-2 are turned off, and the signal from other stations is disconnected, and the local signal is transmitted to other stations through circuits 3-4-3-6, 3-8, and 3-11. Next, circuit PG is set to the address of the called station, and switch CAL is closed to transmit code 2-5 to DELTAM channel. In the pertinent station, this code is detected by DET2 and is stored in M1, and circuit 3-2 or 3-9 is turned on, and decoder DECOD is connected, and buzzer BZ sounds through circuit 3-13. |
