| 摘要 |
PURPOSE: To automatically release the talk lock release of a slave unit from a base station at the time of a talk lock operation and to evade interference at the time of an order taking operation. CONSTITUTION: At the time of talk lock order taking operations, being linked with the off signals of a car detector 46, tones to be sent from the base station to the slave unit are switched to talk lock release tones, sent out from a transmitter 55, demodulated in the receiver 61 of the slave unit and detected in a tone detector 64 and a talk lock is automatically released by a talk control circuit 69. Or, by a talk lock forced release switch 73, the talk lock release tones are sent out at all times and the talk lock of the slave unit left in a talk lock state is forcedly released. |
