Skip to content

Boltek RS485 to USB Adapter

Used for connecting the EFM-100C or ERL-10 Relay Module to a computer or laptop USB port over distances up to 1200m/4000ft.

    Parts Included:

    • RS485-USB Adapter
    • USB Cable
    • Quick start guide

    Shipping is fast and FREE across the USA for all orders $199 or more. For more details about shipping see the full shipping page here.

    We offer 30 Day Easy Returns. If you decide you don't need a product we'll take it back so long as it is in original and re-saleable condition. See the full details here.

    Found a better price online? We'll match it or beat it if we can. 

    All you need to do is let us know via phone or email ( and we'll let you know what we can do.

    You will need to provide evidence of the better price online and it must include any shipping or taxes charged by that site. i.e. It needs to be the total price.

    This only applies to new products, it does not apply to used condition products.