AC-215 Single and Double Door Access Control Unit
Hardware Installation Guide
14
RS485 Connection to the PC
Up to 32 ACU's can be linked together and connected to a single communication port on the
PC.
The RS485 interface must be used when multiple controllers are connected. The serial port
used to control the ACU is assigned in the AxTrax AS-525 software Network Properties dialog
box.
ACU supports the two-wire RS485 interface. RS485 interface enables the distance between
the ACU and PC to be extended up to 4000 feet (1300) meters. The data line wiring must be
in daisy chain formatting with one control unit following another. The first ACU connecting to
the PC must use the MD-14, RS485 to RS232 adaptor.
Daisy Chain
Communication lines must be wired in daisy chain format with one ACU following another.
J1 must be in the RS485 position.
Termination Resistors
At each end of the data line a termination resistor of 130 ohm is required across the L1 and L2
connections.
Modem
The PC modem connection, used to control the ACU, is assigned in the AxTrax AS-525
software’s Network Properties dialog box.
The modem is used when the distance between the ACU and the PC is greater than the
recommended serial connection distance or in an application where an alternative
RS232/RS485 network is unavailable.
The following diagram illustrates remote site modem configuration with AC-215.
J1 RS485 position
J1 RS485 position
J1 RS485 position
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