SK108U includes SK108U-Tx and SK108U-Rx. SK108U-Tx is an industrial serial control transmitter, it works with SK108U-Rx to build wireless switch control system. SK108U-TX is serial interface which can connect with PC and other serial devices. One SK108U-Rx has 4 channels relay output. One SK108U-Tx can control multiple SK108U-Rx. The frequency of the SK108U-Tx and SK108U-Rx can be set to avoid frequency interference.In hardware SK108U-Tx is the same as our SV series module, which has different output power and different
interface for option.
SK108U-Rx is same as SK108 in hardware but different firmware.
Up to 3Km line-of-sight in open area
Frequency Band : 433 ,470,868,915MHz(Optional)
16 predefined channels
Parameters configurable by PC software/ Remote controller/ UART Command
Real-time/Timing working mode for optional
Bi-directional wireless switch control
Sensitivity up to 121 dBm
Maximum output power: 1 W
Indicate and alarm when battery low
Working voltage 9 ~ 30 V
Working temperature range: - 40 ~ + 85 ° C
Remote control switch control
Home automation remote sensing
Wireless remote telemetry
Building automation and security
Access control system
The description of interfaces as below:
The input port is pulled up internally, leave open or connect with 3.3V will result in high level, it is low level when connect to GND.
High level will make the output of the other side short out. And low level will make the output of the other side open. Below is regular connection:
Dip switch Settings (valid when power on again )
DIP8 - Normal working mode selection
ON - Real-time mode ( In this mode, when state changes in input port , it transmit signal immediately)
OFF - Timing mode (Signal transmitted at the predefined time interval according to the setting of DIP6)
DIP7 - master/slave selection
ON - the master
OFF - the slave
DIP6 - Time interval selection of timing mode
ON - Slow time (configurable, default 30S)
OFF - Fast time (configurable, default 2S)
DIP5 - Mode selection
ON - Normal working mode
OFF- Setting mode (Wireless setting on PC via configuration module K108-S)
DIP4~1 - Working frequency channel selection, total 16 channels(default channel interval: 0.5M), frequency is configurable through PC software / UART Command/ Remote controller SK108.
In real-time mode, it is a bi-directional communication. The change of input will be synchronized to the output of the module in other side.
Each module has four independent input and four independent output. In real-time mode, the change of any input of the four channels will trigger the transmission, in other side the corresponding relay of the module will be synchronized after got the signal, then it returns a acknowledged signal. If no acknowledged signal come to the triggered modules, the alarm LED will light on. All the output relays will be resumed open if no acknowledge signal received for continuous 3 times inquiry.
For example, communication between modules A and B,
the 4 output of module A is corresponding to the 4 input of module B,
the 4 output of module B is corresponding to the 4 input of module A, shown as below:
In real time mode, the modules worked in master mode, and the other side worked in slave mode. The slave module will send inquiry signal at fixed time interval , master will send the synchronized message accordingly. The alarm LED will light on and all the four output relay will resume to 0（all relays are in open state）if no synchronized message received for continuous 3 times. The LED will indicate low battery and all the four output relay will resume to 0（all relays are in open state）if get low battery signal from the other side;
Note: Under this working mode, please don’t power on the master and slave at the same time.
In timing mode, the module works in master mode or slave mode. The communication is one way. Communication is from master to slave. The master transmits the wireless signal to slave regularly, the corresponding relay of the slave will be synchronized after got the signal.
The module can worked in fast mode or slow mode by changing the dip switch. The time interval of the fast or slow mode can be configured by PC software (default is 2s in fast mode, 30s in slow mode). The alarm LED will light on and all the four output relay will resume to 0（all relays are in open state）if no synchronized message received for continuous 5 times interval. The LED will indicate low battery and all the four output relay will resume to 0（all relays are in open state）if get low battery signal from the other side;