MAX487 With PIC

[AtomSoft]

Anyone have any notes on using a couple max487 to let 2 pics communicate from long Distances?

I have the data sheet and the most confusing thing is:

"Control Input Voltage (RE, DE)...................-0.5V to (VCC + 0.5V)"

from:
https://www.electro-tech-online.com/custompdfs/2008/06/MAX1487-MAX491.pdf

So is this telling me my pic has to send a Max. of .5v to this IC?

 

[AtomSoft]

i found:
Programming PIC Microcontrollers in BASIC - mikroElektronika
9.5 has some great info!

But code is in basic

RS485Slave_Init(160) ? How to implement in ASM?
RS485Slave_Write(dat,1) ?

 

[Papabravo]

Anyone have any notes on using a couple max487 to let 2 pics communicate from long Distances?

I have the data sheet and the most confusing thing is:

"Control Input Voltage (RE, DE)...................-0.5V to (VCC + 0.5V)"

from:
https://www.electro-tech-online.com/custompdfs/2008/06/MAX1487-MAX491-1.pdf

So is this telling me my pic has to send a Max. of .5v to this IC?

No it is telling you that the input should be limited to a range that includes 0.5V below GND to 0.5V above VCC. A signal outside this range will forward bias the input protection diodes. Trust me on this, you don't want that to happen.

 

[AtomSoft]

oh lol i see it now lol i feel silly now