EverFocus EKR-KB1 operating instructions Standard connection cable

Setup	Description	Example
Devices in	a The devices are connected in pairs
chain	using single lines. These should be
	terminated at the ends. This type of
	setup can only be made when the
	devices have a separate input
	(reception) and output	(transmission)
	channel, like the Videotec DTRX1 and
	DTRX3 receivers.
	The received signal is sent “clean” to
	the next device. If one device is
	blocked, communication is cut off to the
	devices later in the chain.
	The maximum total length is equal to
	the number of lines multiplied by
	1200m for each distance.
Mixed setup	It is possible to set up mixed
	configurations, always bearing in mind
	the limits given above:
	each line can have a maximum length
	of 1200m
	each line should be terminated at the
	ends
	the stubs should be very short (max.
	2m)

3.3 Standard connection cable

The connection between the EKR-KB1 keyboard and the various controlled devices is made only and exclusively using a RS485 serial channel.

When the controlled device does not provide this channel it will be necessary to insert a signal converter (e.g. RS486-RS232 or RS485- Current loop) between the keyboard and the device itself.

Connection with the latest generation of Videotec products (video switchers SM42A, SM82A, video matrix SW328, EKR-8/4, EKR-16/4, etc.) can be made directly using a serial 1.5m telephone cable, which is supplied. A pair of telephone cables with a pair of RJjack shunt boxes can be used to arrive at distances of up to 1200m using the following connection diagram:

	L=1200 m
RJjack1		RJjack2
EKR-KB1	RJjack 1	RJjack 2	Device
RS485A	White	Blue	RS485A
RS485B	Yellow	Black	RS485B

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