Admin Group
Joined: 31/12/2012
Location: New ZealandPosts: 10039
| Posted: 03:11pm 01 Jun 2017 |
Hi redrok - nice to see you around the forums again.
1) 3v0. This is cos there is a 10k pullup on the receiver to the 5v supply, subsequently COM3 RX(pin 26) is idle 3v0 via the potential divider.
2) Certainly possible, but it works just fine without the divider, and I have used these modules on several projects(with a PICAXE data-filter) and they always work fine.
3) Don't know.
I need to bring home my scope from the workshop. It is probably more use here then at the workshop these days! 
Smoke makes things work. When the smoke gets out, it stops!