EverFocus EKB500 Instruction Manual page 10

In case the maximum number of 32 bus participants is exceeded, the number of connected devices can
be increased by using RS-485 distributors. Each distributor output physically provides one RS-485 bus
which enables the additional connection of 31 further devices (the distributor output represents one bus
participant itself).
The maximum system expandability depends on the RS-485 address range of the installed devices.
Attention: Most RS-485 signal distributors (e.g. EDA997A) are unidirectional! This means that the signal
only flows from the input towards the outputs. Therefore, e.g. the interconnection of several EKB 500
keyboards is not possible with this signal distributor!
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EKB500_ma_en_rev1.5_3.doc