3 - Operation
tDynamo| Three-way Secure Card Reader Authenticator | Installation and Operation Manual
Page 25 of 39 (D998200257-20)
3 Operation
3.1 About Operating Modes
During operation, tDynamo transitions between six distinct modes, each of which behaves differently:
Reset Mode occurs when the user presses and the recessed reset switch or holds the pushbutton for 5
to 10 seconds. After resetting, the device progresses to Powered Off Mode. If the device is
connected to USB power, it immediately progresses to Discoverable Mode.
Powered Off Mode is the shipping mode of the device. The operator can power off by pressing and
holding the pushbutton, and the device enters this mode automatically if it has been in Sleep Mode for
a configurable timeout period. When powered off, the device consumes practically no power. To
move the device from Powered Off Mode to Discoverable Mode, press the pushbutton briefly or
connect the device to a USB charger or USB host. When the device is connected to a host via USB,
the device immediately progresses to Connected Mode.
Battery Status Mode is a short mode that uses all four Status LEDs to report the current charge level
of the device’s rechargeable battery (see section 3.4.1 About Power). The operator activates this
mode by tapping the pushbutton briefly in Discoverable Mode or Connected Mode. The device
automatically exits to the previous mode after a short period of time.
Discoverable Mode is the device’s normal waiting state. The operator activates this mode when the
device is not connected to USB by briefly pressing the pushbutton once while in Powered Off Mode.
In this mode, the device remains paired with any previously paired Bluetooth LE hosts, but is not
connected to transmit data. Upon entering Discoverable Mode, the device advertises itself over
Bluetooth LE, and any paired Bluetooth LE host may initiate a connection. To move the device from
Discoverable Mode to Pairing Mode, press and hold the pushbutton for about two seconds until the
General Status LED flashes, then release the pushbutton. If the device is not connected to USB
power, it will move from Discoverable Mode to Sleep Mode automatically when its configurable
timeout period has passed. If the device is configured to transmit data over USB and is connected to
a USB host, it immediately progresses from Discoverable Mode to Connected Mode.
Pairing Mode is activated while the device is powered on by pressing the pushbutton for two seconds
and waiting for the General Status LED to flash, then releasing the pushbutton. In this mode, an
unpaired Bluetooth LE host may initiate pairing. Upon entering Pairing Mode, the device advertises
over Bluetooth LE, and continues to be pairable until a Bluetooth LE host pairs with it or until a
2-minute timeout period expires. Upon successful pairing, the device enters Discoverable Mode.
Connected Mode occurs when the device is connected to a USB host, or when a paired Bluetooth LE
host initiates a connection (generally in response to the host software’s graphical user interface). In
this mode, the host and the device can both initiate communication, and it is the Bluetooth LE host’s
responsibility to terminate the connection and return the device to Discoverable Mode to save power
when an active data connection is no longer needed for the current transaction. If the device is not
connected to USB power, it will move from Connected Mode to Sleep Mode automatically when its
configurable Sleep Mode timeout period has passed. If the device is connected to a Bluetooth LE
host, it does not advertise and is not discoverable by other Bluetooth LE hosts. If the device is
connected to a USB host, it continues to advertise and is discoverable by Bluetooth LE hosts.
Sleep Mode is a low-power standby state. The device enters this mode automatically when it is not
connected to USB power and has been unused (no user input, no communication with the host) for a
configurable timeout period. In this mode, the device turns off all Bluetooth LE functions. To move
the device from Sleep Mode to Discoverable Mode, press the pushbutton briefly or connect the device
to a USB charger. To move the device from Sleep Mode to Connected Mode, connect the device to a
USB host. The device moves from Sleep Mode to Powered Off Mode automatically when its
configurable Power Off timeout period has passed.
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