Guru
Joined: 27/03/2016
Location: AustraliaPosts: 1651
| Posted: 10:36am 02 Dec 2019 |
Ended up finding 3 of the Auto switching modules in one of my parts drawers.
Good thing is that I can directly swap one out for the HC-11 that is currently on Com1 of the heat pump controller, and not need to worry about changes to the board to accommodate the DE pin.
Did also find a good data source on the module, including schematic here...
https://protosupplies.com/product/scm-ttl-to-rs-485-interface-module/
Cheers.