
Installation and Use Manual 11
Installation and Setup
ProLink II Setup Transmitter StartupUsing ProLink IIBefore You Begin
2.5.1 Connection diagrams
Use the following diagrams to make the connection between your PC and the transmitter.
Figure 2-1 Typical HART/Bell 202 connection to transmitter or multidrop network
Model 7835 EXD
(2)
34
MVD
™
Direct Connect
™
with no barrier
(3)
34
MVD Direct Connect with
I.S. barrier
• To barrier
(4)
13 14
• To core processor
(3)
34
Core processor 3 4
(1) If connecting to terminals 1 and 2, terminals must be externally powered, with a minimum of 250
Ω
and 17.5 volts. Requirement does
not apply to service port.
(2) Transmitter version with advanced electronics option only.
(3) Connection is not intrinsically safe.
(4) Intrinsically safe connection.
Table 2-1 Transmitter terminals for ProLink II connections continued
Transmitter
Terminals for connection type
HART/Bell 202 HART/RS-485 Modbus/RS-485 Service port
PV+ PV– A B A B A B
or
DCS or
PLC
R1
R3
R2
Primary mA output terminals
Tra ns mi tt e r
USB plug
Bell 202 signal
converter
Notes:
• Connect the HART interface leads to the primary mA output of the transmitter, or to any point on the network.
• If necessary, use any combination of R1, R2, and R3 to bring the total resistance within 250–600 Ω.
(250–1000 Ω for RFT9712 and RFT9739).
• If no other device is connected to the primary mA output, add R1.
• If the primary mA is connected to a DCS or PLC with R2:
• Where R2 is insufficient, add R1 to bring R1+R2 into range.
• Where R2 is absent, add R3.
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