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Topic: RS-485 (BOB-10124) Wiring help? (Read 619 times) previous topic - next topic



I recently got one of these RS485 breakout boards from Sparkfun with the intention of communicating with a MODBUS device over RS485.

Anyone mind explaining how exactly I wire this up with my Arduino?  The BOB seems to have 3 sets of pins, 2 on opposite sides and 1 row (5,3,2,1) on another edge. 



The Arduino connects to the left side, from top to down:

Vcc => 3V3
RX-I => pin 0
TX-O => pin 1
RTS => any pin you like (digital IO)

The pins on the right are B, A and GND, the connect to the RS485 bus. The bottom pins (marked 5, 3, 2, 1) are the corresponding pins of the RJ-45 connector if you solder on to the breakout.

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