SSR-1U User’s Manual
Rev -, 27 Dec 2019
© 2019 Slerj, LLC
12
www.slerj.com
o
+soft
– The channel records when the
Soft Command
parameter is
true.
With +soft,
Soft Command
is set to
true
at startup, and the DI and PI pins are
ignored. This selection for
Command Source
causes the channel to automatically
record at startup.
o
-dig
– The channel records when the digital input pin (DI) is low.
o
+dig
– The channel records when the digital input pin (DI) is high.
o
-pwm
– Recording starts when the pulse width on the pulse input pin (PI) is
1ms ± 250
s. Recording stops when the pulse width on PI is 2ms ± 250
s.
o
+pwm
– Recording starts when the pulse width on the pulse input pin (PI) is
2ms ± 250
s. Recording stops when the pulse width on PI is 1ms ± 250
s.
The PWM input is designed to work with the type of signal used by hobby servos. The
signal is considered valid when high going pulses are present with a pulse width between
750
s and 2250
s, and a period of 4ms to 65ms. The record state for a channel using the
PWM input is changed only when a valid PWM signal is present that meets the
requirements of the selected PWM
Command Source
(+pwm or –pwm, specified above).
Both the DI and PI pins are 5 volt tolerant and internally pulled to 3.3V. See Section 7.1
Electrical for specifications.
Soft Command
Soft Command
is a Boolean software parameter that is used when the
Command Source
parameter is
±soft
. When
Command Source
is
±soft
and
Soft Command
is
true
, the
channel records. The
Soft Command
parameter can be set through the user interface
module (interactive shell or control protocol).
File Type
The SSR-1U supports three archive types: raw, tagged line, and time tagged archives.
o
When file type is
raw
, bytes are written to file just as they are received, and no
timestamp information is attached to the data.
o
When file type is
tl
(tagged line), text timestamps are inserted into the stream at
the first printable character following a newline or carriage return. This file type
is convenient for line-oriented data, but has a number of limitations as compared
to the time tagged archive. Since received data is modified with timestamp
strings prior to recording, the original data stream is not preserved. The
timestamp format is non-configurable, YYMMDDhhmmss.sss with a trailing
space. Since this mode adds 17 characters to every line received, it can
significantly inflate the volume of data written to the card. A series of 4 byte
lines into the serial channel becomes a series of 21 byte writes to the card, and in
extreme cases (short lines at high speed) could exceed the write bandwidth of the
card. This mode is not appropriate for non-text data.