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A RS-485 distributor can also be used to increase the maximum number of devices on the bus as well as
the total range. Each distributor output provides another RS-485 bus. This allows each output to extend an
additional 1200m, and it also enables the additional connection of 31 further devices to each output (the
output itself represents one device).
The maximum system expandability depends on the RS-485 address range of the installed devices.
System expansion with RS-485 signal distributor
ATTENTION: EDA997A signal distributors are unidirectional! This means that the signal only flows from
the input towards the outputs. Therefore, e.g. the interconnection of several keyboards is not possible with
these types of signal distributor!
1.8.2 RS-485 socket pin assignment
The RS485 pin assignment is as follows:
1.8.3 EKB-500 connection with network patch cable
For a simple, short distance installation, recorder and keyboard can be connected directly using a standard
CAT5 network cable with an 8-pin connector at only one end, and at the other end the Pin 3 wire connected
to RS485 “+” (plus) and the pin 6 wire connected to RS-485 “-“ (minus).
1.8.4 EKB-500 connection to several DVRs
For long distance installations connecting several DVRs, please use an EDA997A signal distributor to
connect. For further details on keyboard connection, please refer to the EKB-500 manual.
RS-485 port communication settings are configured in the I/O CONTROL menu (Section 5.10.4 System
Setup: I/O - control).
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