The SeaMAX API Documentation is the go-to source for understanding the error return values of a SeaMAX function. The SeaMAX documentation for each function provides…
What could cause an error from my first SeaMAX I/O function call?
An error can occur in the first SeaMAX I/O function call if a SeaMAX function call that is necessary to set up the communication…
How should I connect an optically isolated input and voltage supply to a dry contact output?
Sealevel’s SeaI/O modules are a good choice for this application. For example, using a SeaI/O-430 module with 32 isolated inputs, we can connect the dry…
What is “Flyback Voltage” and what should I do about it?
A “Flyback Voltage Spike” occurs when the supply current to an inductive load such as a solenoid is interrupted. Any switching circuit for highly…
What type of relay should I use to control a 24 VDC solenoid?
The Form C relays contained in many Sealevel digital I/O products are the best choice for switching highly inductive loads like solenoids. Other relays, including…
Can Sealevel relay racks be externally powered?
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…
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…