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 TTL adapters are designed for interfacing to industry-standard relay racks that expect an off-state of 5V (TTL “high”). This power on behavior is explained further in the FAQ, Why does my Sealevel Digital I/O TTL adapter have 5 volts present after system power on?

Contact our technical support staff for details on how to order this modification.
This modification is supported on the following TTL devices:

• eI/O-160E and 160PoE
• SeaDAC Lite 8126
• SeaI/O 462E, 462M, 462N, 462S, 462U and 462W
• SeaI/O 463E, 463M, 463N, 463S, 463U and 463W