RS-485 to Arduino Circuit

[scott216]

I have a R.M. Young weather station that outputs data via RS-485.  I want to capture this data with an Arduino.  So I got a MAX485 chip and hooked up this circuit:


Except pins 2&3 don't go to D3, they go to ground via a 10k resistor.  R1 = 120 ohms.  I'm communicating at 9600 baud.  The communication only needs to be one-way: from weather station to Arduino. My Arduino will only be a couple inches from the weather station console, so the RS-485 signal is not traveling far at all. 

I wired this up and it works great.  I want my setup to be very reliable since data from the weather station will signal an alarm under certain conditions.  Is there anything I should do to make this circuit more robust?

[abaxas]

Just go to ebay/aliexpress and buy a serial to rs485 convertor doodar.

£1.64 on aliexpress delivered.

[scott216]

Just go to ebay/aliexpress and buy a serial to rs485 convertor doodar.

£1.64 on aliexpress delivered.

I want to make my own PCB, I have a few other things I need it to do. 

[David_AVD]

You can just tie MAX485 pins 2 and 3 to 0V.  No real need to the resistor unless you want to leave the option to make it bidirectional comms in the future.

Add a 100n bypass cap from MAX485 pin 8 to 0V.

[scott216]

You can just tie MAX485 pins 2 and 3 to 0V.  No real need to the resistor unless you want to leave the option to make it bidirectional comms in the future.

Add a 100n bypass cap from MAX485 pin 8 to 0V.

Thanks.  I used a resistor only because I found a schematic online that had it.  It's nice to know I don't need it.