NRE serial support is available for a 64-bit Windows platform. However, serial-based drivers (for example, modbusAsync, flexSerial, various legacy drivers) are not typically licensed on a Supervisor, and, therefore, are not fully tested or supported on a 64-bit platform.

Exceptions to such license rules can occur with 64-bit engineering workstations and demo machines. Again, 64-bit serial operation is not fully guaranteed.

A known issue with the 64-bit serial library may present itself in initialization phases, with usage of a 64-bit Niagara Serial Tunnel client. For related details see the Niagara Drivers Guide.