SSR-1U User’s Manual
Rev -, 27 Dec 2019
© 2019 Slerj, LLC
15
www.slerj.com
Table 4. Red LED Flash Patterns When Not Recording
Status
Flash Pattern
Description
READY
1
Short flash every 4 seconds
Indicates that a record channel is ready
to record when commanded.
CARD USB
2
Long flash followed by three
short flashes every 2 seconds
Indicates that the card is being accessed
by USB and unavailable for recording.
CARD ERROR
2
Long flash followed by two
short flashes every 2 seconds
Indicates that the card is missing or an
unrecoverable error has occurred.
CARD FULL
2
Two long flashes every 2
seconds
Indicates that the card is full.
1
Presented only on channels configured to record.
2
Presented on all channel LEDs simultaneously.
3.6
USB Interface
USB 2.0 High-Speed access to the microSD card is provided through the auxiliary connector.
When USB access is enabled, complete control of the card is given to the USB host, and serial
recording is suspended. In addition to the standard USB connections (two data signals, 5V
power, and ground), a USB Enable pin (UEN) is provided for flexibility. The SSR-1U can be
powered from the USB interface without enabling USB access to the card. Options for UEN
control are detailed with the
config usben
command in Section 4.3 Device Configuration.