... RS-485, RXD of RS-232 8SLEEPSleep control (input)TTLLow level sleep9RESETReset (input)TTLNegative impulse reset6. Setting of channel, interface, and ... in receiving state, if the IDLE pin continuously connect low level (>200millisecond), the module will be in sleep state, at the ... the state of high level (VH<3.5V), the module can be in receiving state again. YS-C20UA transmitter and receiver with ...