Just got the RS-485 breakout board that uses the SP3485 and am having trouble identifying the pinouts I should use for the A/B signals. want to mount in on a board with a 0.1" pitch and the 0.1" holes don’t line up. Specifically, when I put the header in the set of holes marked for the Arduino side (Tx/Rx/RTS/Vcc/Gnd) the 0.1" holes on the other side don’t line up. Is there a figure that clearly identifies which holes are which (like by the J number on the schematic)? Am I using the correct holes? Do I happen to have a defective board?
Can you post a photo of your board?
don’t see how.
You can use the header on the 5-pin side and three pieces of solid wire (like a resistor lead) on the 3-pin side. You may want to verify the spacing on the breadboard as it looks like both the spacing of the holes and pads are all over the place.
/mike
I know that is a solution. I can use pins on either the 5 pins OR the 3 pins because the spacing between the pins is correct. I was hoping that I was missing something or was trying to use the wrong pins. Would have been nice is they had put the J numbers on the board to match the numbers in the schematic.
The square pad on the RJ-45 pads is pin 1. The pad numbers go up as you zig zag your way down the connector.
If you’re just looking for the RS-485 pads, those are the pads labeled A, B, and G on the edge of the board.
tks but looking to mount it on a “mother board”