... on ISM frequency band, half duplex integrated receiving and transmitting.Modules could directly connect with monolithic processors, PC, RS485 devices, ... is exactly what has been transmitted,suitable for any standard or non-standard user protocols;* Interface format: 8N1/8E1/801 user ... level(>200millisecond), the module will be in sleep status, modules can not receive or transmit any data when sleep.Only ...