Fisher 00275-8026-0001 用户手册
1-3
NOTE: For the HART Communicator to function properly, a minimum of 250
ohms resistance must be present in the loop. The HART Communicator
does not measure loop current directly.
ohms resistance must be present in the loop. The HART Communicator
does not measure loop current directly.
Figure 1-3 and Figure 1-4 illustrate typical wiring connections between the
HART Communicator and any compatible device.
HART Communicator and any compatible device.
FIGURE 1-3. Connecting to the Transmitter Comm Terminals.
FIGURE 1-4. Connecting the HART Communicator to the Loop.
R
L
≥
250
Ω
Power
Supply
+
_
+
_
_
+
mA
+
_
+
_
Current
Meter
+
_
HART-compatible
Device
Device
_
+
Power
Supply
_
+
+
_
Current
Meter
_
+
R
L
≥
250
Ω
_
+
_
+
Device
mA