The power control module EKM 868 is a 4-channel module with 32-bit counter, which counts of four inputs and records their duration. The bidirectional data transmission takes place via a USB radio transceiver operating in the 868 MHz frequency band. It is used to visualize and projection of consumption costs in conjunction with IP Symcon. The count remains valid as long a power supply consists (9V = power adapter). A clear (reset) of the count by a power outage is detected by IP Symcon, a battery backup is therefore not required. The running PC you only need to provide a single value with a timestamp and to generate graphics. A special feature of the EKM 868 is that in addition the current power (consumption) is recorded.
To query counter data, first the virtual Comport driver on Windows must be installed and the USB radio transceiver must be connected.
Now add a new EKM 868 (manufacturer: IP Symcon/ ProJet):
|DeviceID||Default 128 is predetermined. When two EKM 868 are present in a system, in the device a jumpers can be set: the two lower pins (direction Header, upper PIN: NC). The new ID is then 129. ATTENTION: If red LEDs are installed (1 to 4), the ID is 129 by open Jumper! Devices with the ID 130/131, etc. are available on request.|
|CounterID||The ID corresponds to the respective inputs (channels): 1,2,3,4|
|Modus: Read counter||It is read out the count (Variable: Counter) and the time interval in 1/100 seconds between two impulses (Current).|
|Modus: Read on-time||The duty cycle (closed contact) is returned in 1/10 seconds (at 32 bits this results in a period of more than 13 years!)|
|Modus: Read off-time||The off-time (contact open) is returned in 1/10 seconds|
|Impulse||At electricity meters the impulses are entered per kWh. The unit of the variable "Current" is then also kWh. At 0 is the unit 1/100 second - ideal for e.g. to determine the volumetric flow of gas or water meter.|
|Timer activated||With a set tick values are queried in the specified time interval. This is limited to a minimum of 60 sec.|
|Test Center||A command for output values will be sent to the EMK. When properly installed, the variables in the object tree are updated accordingly.|
The inputs are not galvanically isolated - they must not exceed 5V. At plan view, the common ground of the four inputs is the right connection. At every entrance, an RC element was installed: 1K to as pull-up and 100nF mass. A switching e.g. with a reed contact to ground causes a count. The power supply must not exceed = 12V. Higher voltages or reversed polarity lead to destruction of the device. Then, an external protective circuit (Z-diode, resistor) is to provide.
Problem: LED lights permanently Solution: If necessary, swap the wires of the respective counter input (electronically) or wait until the counter continues to rotate and releases the reed contact (mechanical).