Communications
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AC-215 Installation Manual
5.
Communications
Communication lines are used to upload and download information between
the ACU and the AxTrax™ AS-525 software. Communication between the
ACU and PC is displayed by the system’s two LEDs.
The RX LED flashes when the controller receives data
The TX LED flashes when the controller transmits data
The ACU address is defined in the AxTrax™ AS-525 software. For successful
communications, the dipswitch must be defined with the same address.
There are three connection modes:
Serial
RS232
RS485
Modem
LAN
5.1
Serial Connection
The PC Serial Port controlling the ACU is assigned in the Network Properties in
the AxTrax™ AS-525 software. By default the default is set to 9600 for direct
connection to the PC using the standard RS-232 interface.
5.1.1
RS-232 Connection
Table 4: RS-232 Connection
ACU
DB9 Connector
DB25 Connector
GND
Pin 5
Pin 7
Tx
Pin 2
Pin 3
Rx
Pin 3
Pin 2
DTR
Pin 4
Pin 20
The RS232 connection can only be used for one ACU. The distance between
the PC and ACU can be no more than 150 feet (50 meters). If the baud rate is
increased to 57600 the distance can be up to 30 feet (10 meters). J1 must be
in the RS232 position to select the RS232 communication.
5.1.2
RS-485 Connection to the PC
Up to 32 ACUs 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.