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Chapter 4: Installation
4. Installation
• Find a location suitable for installing the A/B Switch, with access to AC power and the connections you intend to switch
through the unit.
• If you intend to use serial control (SW1041A), connect a serial cable to the DB9 RS232 console port. The baud rate is fixed at
9600 baud, no parity, 8 data bits, and 1 stop. See table 6.1 for the console port connector pin assignments.
• If you intend to use external dry contact closures to control the A/B Switch, connect the external contacts to the 6-position
terminal block as described in Section 5.2.
• Connect the provided 12-VDC power supply to an AC source and to the 3.5 mm power supply connector on the A/B Switch.
When power is first applied, it is recommended that the user change connection states on the A/B Switch from A to B and back
again to be sure that all the relays are in a known state, prior to connecting any external devices. Press and hold (for
approximately 1 second) the appropriate front panel pushbutton switch until the A/B Switch changes connection state. One of
the LEDs, A or B, on the front of the unit will indicate the selected connection state and also serves to show that the switch has
power.
• Connect RJ-45 cables (SW1040A, SW1041A) between the A, B and C ports on the switch and your devices. The A/B Switch
connects the C (Common) port to either the A or B port.
NOTE: The A/B Switch ports provide straight-through connections and are bidirectional, i.e. they have no preference to signal
direction. If your application requires a crossover cable, use only 1 cross-over cable in that path. Use a straight through
cable on the other side of the switch.
• If you are connecting the Ethernet control interface on the A/B Switch (SW1041A) to your network, you must first set the IP
address, subnet mask and gateway address parameters of the A/B Switch using the serial port. You should set these parameters
before attaching a cable to the NETWORK port, as the default parameters may not work or could interfere with the operation
of your Ethernet network. See Section 6 for more information regarding IP setup.
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