
Advant
®
Smart Device (HART
®
) Interface User’s Guide
Section 2.3.1 Connecting to a SHIM
3BUR 001 085R0001 REV A 2-37
The SHIM powers the smart device in Figure 2-28, therefore, an external 50 mA fuse is required
between the smart device TX+ and SHIM Excitation connection. This is done to prevent a
blown Excitation fuse from taking down all smart transmitter loops powered by the SHIM.
Figure 2-28. Smart Device Wired to a TRIO 6230B Analog Input/Output Block
SMT
XMT
+
-
+
-
24 V dc
P
P
6230B
IN
JMP
P
Analog Input/Output Block
250
RTN
P
Tx
Rx
SHIM
Exc
Sig+
RS-232
Sig-
P
HART Bus
50 mA
Power Supply
SMT
XMT
+
-
+
-
24 V dc
P
P
6230B
IN
JMP
P
Analog Input/Output Block
250
RTN
P
D+
D-
SHIM
Exc
Sig+
RS-485
Sig-
P
HART Bus
50 mA
Power Supply
RS-232
to
RS-485
Conv.
RS-232
Daisy Chain
to next SHIM
MVI
port
TRIO
Field
bus
Advant Controller
MVI
port
TRIO
Field
bus
Advant Controller
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