Figure 12: 4-20 Ma Circuit Diagram - RST Instruments RSTAR Affinity Installation Manual

The pin assignments are:

Pin 1 – shield

Pin 2 – sensor 1 +12V DC output source

Pin 3 – sensor 1 shunt input

Pin 4 – sensor 2 + 12 VDC output source

Pin 5 – sensor 2 shunt
PSM0003A

Figure 12: 4-20 mA Circuit Diagram

RST Instruments Ltd.
RSTAR Affinity
Data Logger
Installation Guide
Page 19