Guru
Joined: 24/12/2017
Location: AustraliaPosts: 1639
| Posted: 06:57pm 02 Dec 2019 |
Thanks for that Phil23. The circuit is similar to that posted by Tinine but the 27uS delay has been extended out to over 5mS! It looks like a good device, well protected and documented.
Considering that I bought the MAX485 chip locally for $5.95 the price is good too.
I have used one of these devices on my laptop to talk to RS485 devices using DOS MMBasic. It must use a similar automatic direction control.
Bill
Keep safe. Live long and prosper.