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5. Operation
Whenever the 2U Auto Bypass Switch is powered OFF, or if power fails, the non-latching relays in the 2U Auto
Bypass Switch will be in the “A” position, connecting the devices/networks attached to the “A” ports to the “C”
ports of both sets of A/B switching elements within the 2U Auto Bypass Switch. When power is applied to the 2U
Auto Bypass Switch, the appropriate power supply status indicators (PS1 and/or PS2) will light and LED indicators
“A” on the front of the unit will also light to show that the non-latching relays in the 2U Auto Bypass Switch are in
the “A” position. Both A/B switching elements in the 2U Auto Bypass Switch will remain in the “A” position until
the user manually changes switch states via command or via the front panel toggle switch, or if auto recovery
switching is enabled and the 2U Auto Bypass Switch determines that the normal path is available.
5.1 Manual Switching
The 2U Auto Bypass Switch can be switched (both sets of ports simultaneously) from the momentary toggle switch
located on the front of the Controller Card. This switching action is enabled by the front panel keylock switch also
located on the Controller Card, which must be in the position labeled ENABLE for manual switching to occur. The
individual toggle switches on each A/B Switch Card can also be used to switch just that card between the A and B
states. This feature may be useful for troubleshooting or during initial installation..
5.2 Serial RS232 Switching
The 2U Auto Bypass Switch can be switched using commands over a serial communications line. The parameters
of the RS232 console port are fixed at 9600 baud, no parity, 8 data bits, 1 stop and no flow control (commonly
abbreviated as 9600, N, 8, 1, NONE).
When the 2U Auto Bypass Switch powers up, it will send a sign-on message followed by a prompt character “>” to
your serial terminal device. After each command is executed, the associated response from the Auto Bypass Switch
will be issued, followed by a prompt character. For systems where the console port is being commanded by
software, the software should wait for this prompt character before sending each and every command to the 2U Auto
Bypass Switch.
It is possible to switch either or both sets of switch ports in that controller card’s switch module group to the A or B
connection state using the appropriate serial commands. It is also possible to query the position of either or both sets
of switch ports using serial commands. The RS232 serial interface is NOT affected by the position of the front
panel keylock switch – it will act upon and respond to commands it receives even if the keylock switch is in the
DISABLE position.
To display a complete list of the commands available via the serial RS232 interface, type “help” at the command
prompt as shown below. For a detailed description of each command, see section 7.
> help
CONSOLE COMMANDS:
GET ALL (display all parameters)
GET VERSION (display software versions)
SET SYSTEM [A/B] (control respective A/B switch card group)
SET RACK N (control respective A/B switch card group)
GET[SET] PORT N [A/B] (control single port)
GET POWER N
GET[SET] IPADDRESS [X.X.X.X]
GET[SET] SUBNETMASK [X.X.X.X]
GET[SET] GATEWAY [X.X.X.X]
GET[SET] READCOMMUNITYNAME [string]
GET[SET] WRITECOMMUNITYNAME [string]
