Honeywell XNX Quick Start Manual page 17

Power and 4-20mA connections are made at TB-1 and are identical for the EC,
IR, and mV personality boards. The minimum loop impedence is 200 ohms; the
maximum is 500 ohms when the transmitter is supplied with an input of 16 volts.
Failure to perform "Calibrate mA Output" or with loads outside the recommended
values may result in diagnostic warning or fault messages.
The total load resistance recommended for the 4-20mA output should be kept
lower than 500 ohms, including the resistance of the properly selected 4-20mA
cable and input impedance of the equipment to be connected.
XNX Universal Transmitter Quick Start Guide
Controller
+VE
1
R
L
Signal
2
-VE
3
Figure 5. Sink wiring for XNX
Terminate cable screen at the detector or controller, not both.
Controller
+VE
1
Signal
2
Current
R
Flow
L
-VE
3
Figure 6. Source wiring for XNX
Controller
+V1
+V2
-V2
-V1
Figure 7. Isolated wiring for XNX
XNX
+V
1-1
+mA
1-5
Current
Flow
-V
1-3
XNX
+V
1-1
-mA
1-6
-V
1-3
XNX Source Configuration
XNX
+V
1-1
+mA
1-5
-mA
1-6
-V
1-3
XNX Isolated Configuration
17