Meinberg TCR51USB - Manual (Page 10)

10
USB Interface
The TCR51USB contains a USB interface which is used for the communication and
parameterization of the device with the Monitorprogramm.
Connectors and LEDs
The housing of the TCR51USB contains the connectors for the Timecode (IRIG AM/
DC), two LED‘s, the key for the Bootstrap-Loader as soon as the the USB connector.
The LEDs signal the status of the IRIG receiver.
The upper, red LED is switched on whenever the
internal timing of TCR51USB is in holdover mode.
This state arise after power up and if an error in the
IRIG telegram is detected. This LED changes state
only at change of minute.
The green LED (Lock) is switched on as soon as
the internal timing of TCR51USB is synchronized
to the received IRIG code by a PLL (Phase Locked
Loop).
Pressing the hidden key BSL is required for acti-
vating the Bootstrap-Loader before updating the
firmware.
The USB connector is used for the
communication of the Device with the PC. IRIG AM
IRIG DC
Lock
Holdover Mode
USB Connector
BSL
PPS (optional)