KR20 Wireless Unit

1.When mounting, (wiring, adjustment etc.), be careful not to add static electricity to connector, switch and antenna.
2.Do not squeeze the switches or push buttons with an excessive force. Otherwise, they may be damaged.

• 1.Do not place the units in the vicinity of radios or TVs. Otherwise, the reception may be impaired.
• 2.If nearby broadcasting or wireless stations emit radio waves with a high field intensity, then this wireless system may not be used.
• 3.This system uses frequencies on 2.4 GHz band for data communication. If there are other devices using the same frequency band in its vicinity, then the communication may be impaired due to interference.
• 4.In order to make the wireless performance better, pay attention to the below items.

• 5.When mounting the unit to DIN rail, hook the upper part and push DIN hook. When removing it, pull out with minus driver until locking DIN hook. And fastening plate (ATA4806) is recommended to prevent from moving.

Wired communication restrictions

・Separation of data sent on wire The wireless unit detects the end of data sent on wire not by control codes such as "CR", etc., but by the idle time. Initially, if there is an idle time equivalent to 10 characters, then it will be deemed the end of data and the wireless unit will start communicating. Therefore, if consecutive data includes an idle time equivalent to 10 characters or more, then the data will be separated. However, if the idle time between two successive items of data is equivalent to 10 characters or less, then they will be deemed to be partial data and will not be sent correctly.

・Direction of communication between the master and slave (1:1 topology with repeaters or 1:N topology) Command and response is assumed in the communication procedure. Set the master to a command sender and the slave to a response sender. Otherwise, the communication is impossible. If both units are set to command senders, then communication will not be possible.

・Command and response sequence
If commands are sent in succession, then define a sequence, in which a command is sent after the response to the previous command is returned. If a time-out is defined, then the time required for wireless communication must be taken into consideration. The time required for wireless communication may be extended depending on the communication environment. If the interval between two commands is fixed, then a command and a response may collide with each other.

Input signal time

During 1:1 topology or 1:1 topology with repeaters for the I/O type , the input or output signals are not always monitored. They are monitored only immediately before wireless transmission and when their information is transmitted. In this case, if the input signal duration is shorter than the polling time*1, then it may not be transmitted to the output terminal. Therefore, in order to ensure that the input signal is transmitted, it must be held for the polling time or more. *1 The polling time refers to a cycle for the master to continuously transmit (polling) data to a slave. *2 The response time refers to the time required for the signal inputted to the input terminal to be outputted from the output terminal of the partner unit.

Protocol for 1:N topology

In the frequency band using this unit, in-plant radio station (license is necessary.) using at industrial such as microwave oven, science, medical machinery and a production line in factory to identify mobile object, specified low power radio station (license is not necessary.) and amateur radio station (license is necessary.) are managed

• 1.Before using this unit, please confirm that in-plant radio station to identify mobile object, specified low power radio station and amateur radio station are not managed.
• 2.When some cases of harmful electric wave interference occurred from this unit to an in-plant radio station to identify mobile object, change the using frequency immediately or stop discharging the electric wave. After that please contact us to consult measures to avoid interference (for example, setting of partition).
• 3.When any other troubles such as harmful electric wave interference occurred from this unit to a specified low power radio station or an amateur radio station or an amateur radio station, please contact us.

[Note] Countries where the use of KR20 has been authorized
Products with the indication label affixed to their rear side As of May 2008, the use of KR20 has been authorized in the following countries:
Japan, China^*1, Thailand, 25 European countries (Austria, Belgium, Czech Republic, Denmark, Estonia, Finland, France^*2, Germany, Greece, Hungary, Iceland, Ireland, Italy, Lithuania, Malta, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland, UK, Netherlands)

*1	From March 31, 2013, this product will not be available in China.
*2	In France, this product must not be used outdoors. Please use it indoors only.

Obtained the European wireless certification (EN300 328)
In order to comply with EN standard, use this product in following condition.

･ When installing this product to wall, install it on a DIN rail.
･ Use power supply cord that is less than 3m.
･ For communication cable (RS232C or RS485), use shielded cable, and connect one end of shield wire to ground. And use ferrite core (correspond to TDK: ZCAT2035-0930) in the communication cable (RS232C or RS485) of wireless unit side. (Turn numbers: 2T)