Yes, all Sealevel relay racks allow an external power source to be connected to the V+ and Ground terminals. However, you need to take steps…
Do I need to add pull-up or pull-down resistors to my Sealevel inputs?
No. Sealevel optically isolated and dry contact inputs are current-mode inputs, which do not require external pull-up (or pull-down) resistors to be added for…
Can I guarantee that my Sealevel Digital I/O TTL adapter outputs always power on at zero volts?
Yes, many of our TTL products can be modified to always power on with an off-state of zero volts (TTL “low”). All of our standard…
What is the ‘Gen Mod’ that Sealevel recommended?
‘Gen Mod’ is an abbreviation of ‘Generic Modification’ and it ensures that the COM port assignments on a USB serial adapter are always the…
What is a SMARC module?
SMARC (an acronym for “Smart Mobility ARChitecture“) defines a specification (pdf) for extremely compact and low-power Computer-on-Module (COM) solutions. SMARC modules use ARM, RISC or…
What kind of touchscreen is used on the HazPAC R9-8.4 computer?
The HazPAC R9-8.4 touchscreen integrates a flexible glass touch sensor that increases the durability and reliability of traditional resistive touch sensors. During the manufacturing…
Should I use an RTD or thermocouple to measure temperature?
There are several factors to consider when choosing a temperature sensor. A Resistance Temperature Detector (RTD) is typically a metal coil wrapped around a ceramic…
Why do I receive Certificate Errors on the Sealevel website?
Most users reporting this issue are using Windows XP and some version of Internet Explorer. The Sealevel website uses the latest methods of SNI (Server…
Are Sealevel optically-isolated inputs active high or active low?
It depends on how the input is wired to your application. An input is triggered when the input terminal and local common terminal of…