SSR-1U User’s Manual
Rev -, 27 Dec 2019
© 2019 Slerj, LLC
14
www.slerj.com
X
hex digit month [1-C]
d
day of year [001-366]
2
two digit sequence number [00-99]
3
three digit sequence number [000-999]
4
four digit sequence number [0000-9999]
*
This field identifier is lower case.
File Size
The SSR-1U supports automatic file close and reopen when a size (or time) threshold is
reached. Threshold values of 1 MB, 2 MB, 4 MB, 8 MB, 16 MB, 32 MB, 64 MB, 128
MB, 256 MB, 512 MB, and 1024 MB are supported. Additionally, the File Size
parameter can be set to
Hour
,
Day
, or
Week
, causing new files to be started based on time
instead of size. By default, the File Size threshold is
off
, and no automatic close/reopen
operations are performed.
3.3
User Interface Module
The user interface module provides user access to file system operations, device status, and
configuration. The module can be assigned to only one serial channel and can be configured to
present either an interactive shell interface or the control protocol on that channel. More
information on the interactive shell and control protocol can be found in Sections 4 and 5,
respectively.
3.4
Real-Time Clock
The Real-Time Clock (RTC) maintains calendar time for the SSR-1U. An on-board backup
battery (CR1220 or CR1216, Lithium 3V) allows the RTC to keep time across power cycles.
RTC time is used for file creation and data timestamps.
3.5
Digital I/O
Digital input and output lines are provided to control recording and provide status. On the main
connector, PI and DI provide record control as discussed in Section 3.2. Additionally, a status
line is provided for channels 1-3 (S1, S2, and S3) to indicate when the channel is recording. A
bi-color (red and green) LED indicates status for channels 1-3 (Figure 1). The green segment
flashes to indicate reception of serial data on the channel. The red segment illuminates solid red
when the corresponding channel is recording. When the channel is not recording, the following
flash codes are presented using the red LEDs.