Up for sale is a DO-4 Andover Controls DO-4-O RS-485.

This item is in good cosmetic condition may show surface wear, but no chips scratches, gouges or breaks. Item was removed from a working enviorment, but has not been tested by me. Please see pictures for condition and further specifications. There are (8) units available all in similar condition to the one pictured. 

Any questions just ask. 

Thank you.