connections.txt

======Host board======

block diagram:
rj45 socket - MAX485 - arduino leonardo - USB to PC
          '-- 12V in connector


rj45 pins6,7,8 - connector 12V
arduino VCC - MAX485 VCC
arduino GND - MAX485 GND - rj45 pins1,2,3 - connector GND

MAX485 RE - MAX485 DE - arduino pin2

MAX485 RO - arduino RX
MAX485 DI - arduino TX

MAX485 A - rj45 pin4
MAX485 B - rj45 pin5

======sensor board======

block diagram:
rj45 socket - MAX485 - arduino pro mini - 4 pin connector - sensor
          '-- 12V out screw terminals

arduino RAW - rj45 pins6,7,8 - terminals 12V
arduino VCC - sensor +V  (red wire) - MAX485 VCC
arduino GND - sensor GND (blk wire) - MAX485 GND - rj45 pins1,2,3 - terminals GND

MAX485 DE - MAX485 RE - arduino pin2

MAX485 RO - arduino RX
MAX485 DI - arduino TX

MAX485 A - rj45 pin4
MAX485 B - rj45 pin5

arduino A0 - sensor TMP (green wire)
arduino A1 - sensor RV (blue wire)