STORAGE
8 GB
Industrial eMMC.
No SD card.
Keeps a rolling history on built-in storage. The oldest data is overwritten first, or capture stops when full.
Days to months, depending on traffic¹
REMORA SFL-2 · SERIAL FIELD LOGGER
The serial logger you leave on site.
Read the logs later.
The SFL-2 records the UART, RS-232 or RS-485 output of your device on two isolated channels, for days or weeks, with no laptop attached. When the fault finally shows up, the log is there.
Planned price $299
Pre-orders open January 2027
How it works
120 × 74 × 30 mm · optional DIN-rail mountSFL-2
WHAT IT DOES
One job,
done properly.
Record serial output unattended, then give you plain files to work with.
Industrial eMMC.
INPUTS
2 channels
Isolated inputs.
One timebase.
Log a processor and its modem side by side. Each input has its own isolated ground and is receive-only in hardware.
TTL · RS-232 · RS-485/422
LOG FILES
.txtplain text
Plug in USB-C.
Copy the files.
The logs appear as a read-only USB drive with timestamped text files. Use grep, your editor or your own scripts.
No account, no cloud, no special viewer
¹ About 53 hours with both channels saturated at 115,200 baud, much longer with typical console traffic. All figures are design targets and will be confirmed on production hardware.
IN USE
Set it up,
then leave it.
Typical cases: a device that resets once a week at a customer site, an overnight soak test, a problem nobody can reproduce in the lab.
USE CASES
Where it helps
Situations we designed it for. No testimonials yet: the product is not shipping.
Weekly reboot at a customer site
Configure it at your desk and ship it. A technician connects RX and ground and leaves. Weeks later, you read the crash trace from “Tuesday around 2 pm”.
Burn-in over a weekend
Record the boot logs of a rack of units in the burn-in room and find the one that hangs. One config.txt, copied to every logger.
Processor against modem
The application processor blames the modem, the modem blames the processor. Record both on one timeline and see who went first.
RS-485 bus that fails at night
Tap a building-automation bus passively. The logger cannot transmit, and the isolated input copes with ground offsets.
Climate chamber overnight
Run a temperature profile overnight and keep the device’s console output, with no PC in the lab.
Old machine, RS-232 service port
A legacy controller with a service port at 9600 baud, 7E1. Real ±12 V RS-232 levels and legacy framing are supported.
The last lines before a power cut
What did the firmware print in the half-second before the brown-out? Power-loss-safe writing is designed to keep those lines.
HOW IT WORKS
Connect. Leave. Read.
No software is needed to capture. You only need a computer to change settings or read the logs.
Connect
Set the interface and voltage level with the switches. Wire RX and ground, then power it.
Leave it running
Power it from USB-C or 9–30 V DC. Both channels are recorded against the same clock.
Read the logs
Plug in USB-C and open the files. Find the reset or the error, and what came before it.
THE OUTPUT
What the log looks like
Plain UTF-8 text, one line per event, both channels in one file. Every line stands on its own.
2026-08-31T14:07:02.123456+02:00 0000123456.789012 MAIN E (4711) wdt: task watchdog triggered: cli_task
2026-08-31T14:07:02.123500+02:00 0000123456.789056 MODEM +CEREG: 1,"1A2B","01C3D4E5",7
2026-08-31T14:07:04.001210+02:00 0000123458.666770 SYS # MARK n=3 src=button
2026-08-31T14:07:09.442001+02:00 0000123464.107561 SYS # BOOT fw=1.0.2 sn=SFL-26-000123 reason=target_reset
❯ grep '# GAP\|watchdog' *.log
- Wall-clock time
Date and time with UTC offset, in microseconds.
- Monotonic counter
Seconds since start. Stays correct even if the clock is adjusted.
- Channel
A name you choose per input. SYS is the logger itself.
- Payload
Exactly what your device printed. Non-printable bytes are kept as \xNN.
Logger events (SYS)
- # BOOT
- logger started, with firmware and serial number
- # MARK
- marker button pressed
- # GAP
- data lost, with the exact byte count. Never silent.
- # PWRFAIL
- supply lost
- # TIMEADJ
- clock adjusted. Old times are never rewritten.
- # CONFIG
- settings changed, old and new values
Files
A new file every 24 hours or 16 MiB. Use grep, awk and sort as they are, or the planned sfl.py script to merge devices and filter by channel or time.
Log format as planned (SFL-LOG-FORMAT v1). Details may still change before release.
TECHNICAL DATA
Specifications
Planned values. Final specifications will be published before pre-orders open.
- Inputs
- 2 × independently isolated, receive-only serial channels
- Interfaces
- TTL 1.8 / 3.3 / 5 V · RS-232 · RS-485/422 tap
- Storage
- 8 GB industrial eMMC · rolling or stop-when-full
- Baud rate
- 300–1,000,000 baud per channel; 2 × 1 Mbaud simultaneous (design target)
- Time
- Shared timebase · wall clock + monotonic counter per line · battery-backed RTC
- Log access
- USB-C · read-only FAT32 snapshot · UTF-8 text
- Configuration
- Chrome / Edge via Web Serial, or a text configuration file
- Power
- USB-C 5 V or 9–30 V DC · no internal battery for operation
- Enclosure
- 120 × 74 × 30 mm · optional DIN-rail mount
- Environment
- −20 to +60 °C (design range) · fanless
Power loss. Designed to protect recorded data on power loss and to mark gaps in the log explicitly. To be verified before release.
Field installation. Push-in terminals, settings on physical switches, optional DIN-rail mount. No Wi-Fi or Bluetooth.
ABOUT US
Made by embedded engineers, for embedded engineers.
- 15+
- years in embedded development
- CH
- designed in Switzerland
We are embedded engineers based in Switzerland, with more than 15 years of experience developing embedded software and hardware.
A lot of that time went into tracking down faults that only show up in the field: at a customer site, in a machine, never on the bench. The usual workaround is a laptop left behind with a serial terminal open. It works until the laptop goes to sleep, the USB adapter drops out, or someone needs the laptop back.
The SFL-2 is the tool we wanted in those situations: small, robust, and simple enough to install and forget until you need the data.
PRE-ORDERS OPEN JANUARY 2027
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pre-orders open.
We will email you when pre-orders start and when the final specifications are available. Nothing else.
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REMORA SFL-2PLANNED PRICE
$299 / unit
Two channels, 8 GB industrial eMMC,
standalone serial capture.
Buying for a team?
$249 / unit from 10 units
$249 / unit from 10 units
Pre-orders planned for January 2027. Final price, taxes and shipping will be confirmed before you can order. No orders or payments are taken yet.
FAQ