
Communications
RS-232 Connection to the Computer
Set the J1 switch to the RS-232 position.
Access
control panel
DB9
Connector
DB25 Connector
GND Pin 5 Pin 7
Tx Pin 2 Pin 3
Rx Pin 3 Pin 2
Note:
The RS-232 connection can only connect a single access
control panel to the computer.
The distance between the computer and the access
control panel must be no more than 150 feet (50 meters).
If the baud rate is increased to 57600 or beyond, the
distance must be no more than 30 feet (10 meters).
RS-485 Connection to the Computer
Set the J1 switch to the RS-485 position.
Up to 32 access control panel's can be linked together and
connected to a single communication port on the computer.
Use the RS-485 interface for situations where there will be
multiple controllers connected. The serial port used to control
the access control panel is assigned within the VeriTrax AS-225
software.
The Access control panel supports the two-wire RS-485
interface. RS-485 interface enables the distance between the
Access control panel 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
Access control panel connecting to the PC must use the MD-
14 RS-485 to RS-232 adaptor.
AC-225 Hardware Installation and User Guide Page 34
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