#daisy

arrangement

datalogger

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Bottom:

• programmed via FTDI cable, board = "Arduino UNO"
• estimated < 100 microAmp sleep current
• DS1337 RTC with battery backup
• i2c EEPROM, 512KB storage
• RJ45 connector for 8-wire CAT-5,6,7 cable
• pin headers allow for patching RJ45 to digital / analog / power / ground
• JST header for battery power (or use remote)

remote

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Bottom:

• RJ45 connector
• JST header for battery power (or use remote)
• RJ45 pins broken out via header for custom patching
• 3 LEDs connected to ethernet pins 1,2,3 (if placed)
• 2 momentary buttons connected to ethernet pins 4,5 (if placed)
• mounting holes

remote w/ display

Replaces LEDs with a 128x32 OLED display from Adafruit:

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To hook up Adafruit OLED display:

• 3.3V OLED VIN.
• GND to OLED ground (GND).
• I2C SCL (A5) to OLED SCL.
• I2C SDA (A4) to OLED SDA.
• digital 4 to OLED RST.
• these pins are marked on the remote-display board. Proper relevant patching must be done on the logger, to match.

ref

http://pinouts.ru/NetworkCables/ethernet_10_100_1000_pinout.shtml