EDIT: Should have looked first before asking the question. MASSO Relay Output 7 carries the E-stop signal. Please ignore below.
The E-stop buttons and the E-stop input to the G540 are at different potentials. To have the E-stop on the G540 operate when either of the MPG or external E-stop buttons are pressed I need to interface a relay.
E-stop Pin #2 on the MASSO supplies a suitable signal to drive a relay, perhaps not directly but through some interface device e.g. FET, Transistor or Optoisolator. Even though it's not an output pin per se, can you please tell me the current sourcing/sinking ability of this pin?