Digi TransPort WR31 User Manual page 50

Hardware
TransPort WR31 digital input/output: representative circuit
DIGITAL INPUT
DIGITAL RETURN
TransPort WR31 analog input: representative circuit
ANALOG INPUT
ANALOG RETURN
Example digital and analog I/O wiring
Digi TransPort WR Routers User Guide
WR31_3v3
Current Loop
Protector
200 Ohm
TransPort WR31 hardware
Pull up Enable Signal
Digital Input
Digital Output Enable
Analog Select Signal
Current Loop Signal
Voltage Input Signal
Analog Input
50