The module I received was marked “485 Relay 2CH V1.1” on the top. There’s a AMS1117-3.3 (www.advanced-monolithic.com) LDO voltage regulator (3.3V), a Shenzhen Hangshun Chip Technology Development ...

The relay repeater module accepts single contact closure inputs from logic solver trip outputs including the company's STA Safety Trip Alarm and the SPA2 Programmable Limit Alarm Trip. With three ...