Output Wiring
continued
RFT9739 Rack-Mount Transmitter Instruction Manual
57
O
u
tp
ut Wi
ri
ng
Star
tu
p
T
ro
u
b
le
s
hoo
ting
Be
fo
re
Y
o
u
B
e
g
in
Getti
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rted
M
oun
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P
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Suppl
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Sen
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To connect the transmitter to a Bell 202 network, use RFT9739 terminals
CN2-Z30 and CN2-D30. See Figure 5-30.
• SMART FAMILY devices require a minimum loop resistance of
250 ohms. Loop resistance must not exceed 1000 ohms.
• Connect the mA outputs from each transmitter together so they
terminate at a common load resistor, with at least 250 ohms
impedance, installed in series.
Figure 5-30. Typical HART
®
network wiring
PV+
17
PV–
18
PV+
CN2-
Z30
PV–
CN2-
D30
4-20mA
4-20mA
24
DC
For optimum HART communication, make sure the
output loop is single-point grounded to instrument
grade ground.
HART
Communicator,
ProLink PCI,
or AMS modem
RFT9739
field-mount
RFT9739
rack-mount
SMART
FAMILY
trans-
mitter
SMART
FAMILY
trans-
mitter
DC source required for
other HART 4-20mA
passive transmitters
IFT9701
R-Series
250 ohm
load
Summary of Contents for Fisher Rosemount RFT9739
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