A/B SWITCH WITH REMOTE INTERFACE
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3. Configuration
There are no DIP switch or jumper settings that need to be modified in order to operate the basic functrions of the
A/B Switch. There are however, several parameters related to Ethernet remote access/control and the automatic
switching features that are configurable. These settings are described later in this manual.
The internal jumpers and DIP switches inside the A/B Switch have been pre-configured at the factory and should not
be changed from their default settings. They are shown here for reference only.
Jumper W1
1-2 position = no Ethernet control module
2-3 position = Ethernet control module installed
Jumper W2
1-2 position = no Ethernet control module
2-3 position = Ethernet control module installed
Dipswitch SW1 (resistors may be installed for “closed” positions)
Position 1: open – Latching Relays, closed – Non-Latching Relays
Position 2: open – No Ethernet control module, closed – Ethernet control module installed
Positions 3 thru 8: open (reserved for future use)
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, 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.
•
Depending on the model of the A/B Switch being installed, connect RJ45 cables, DB9 cables or fiber optic
cables 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 that the A/B Switch ports provide straight thru connections
and are bidirectional, i.e. they have no preference to signal direction. If your application requires a cross-
over 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 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.
