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AC-425 Hardware Installation and User Guide
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Use the RS-485 interface for situations where there are multiple controllers connected.
The serial port used to control the access control panel is assigned within the AxSraxNG™
software.
The AC-425 panel supports a 2-wire RS-485 interface. Using the RS-485 interface can
increase the distance between server and panels up to 4,000 feet.
To use the RS-485 interface, the panels must be connected in a daisy-chain formation with
an MD-14 adapter.
6.1.3
Daisy Chaining
You can connect up to 32 panels to a single serial line using a daisy-chain formation.
The first panel is connected directly to the server using an MD-14 adaptor, while the
second panel connects to the first panel. Additional panels are connected in the same way,
one after another. The maximum distance from the PC to the last panel in the chain is
4,000 ft (1,219.2 m).
Figure 19: Daisy Chaining
At each end of the data line, both where the panel connects to the server and on the last
panel in the network, a termination resistor of 120
Ω
may be required. Apply the resistor
across the L1 and L2 connections.
These termination resistors are especially important in long cable runs.
6.2
TCP/IP Network Connection
The computer running the AxSraxNG™ server can communicate with the access control
panels via a TCP/IP network. The connection settings are controlled within the AxSraxNG™
Client software.
