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Configuration and Use Manual 21
Digital Communications Setup
Installation Using the DisplayDigital Communications SetupBefore You Begin
Figure 3-6 Model 3350 or Model 3700 with HART interface
Figure 3-7 HART/analog single-loop wiring
HART interface
Remote
device
Serial port connection
(with 9-pin to 25-pin
adapter if necessary)
Wire size is 22 AWG (0,35 mm
2
)
Input/output terminal block
600 Ω maximum loop resistance
250 Ω minimum loop resistance
Resistance:
• Analog only: 820 Ω maximum loop resistance
• HART only or HART/analog:
- 600 Ω maximum loop resistance
- 250 Ω minimum loop resistance
+–
+
–
+
–
Terminal block for Model 3300 or
Model 3500 with screw-type or
solder-tail connectors
Terminal block for Model 3300
or Model 3500 with IO cables
Terminal block for
Model 3350 or Model 3700
HART device
(with optional signal
converter)
HART device
(with optional
signal converter)
HART device
(with optional signal
converter)