GE Masoneilan VECTOR V1100 Instruction Manual page 46

GE Oil & Gas
VECTOR V1100 with HART Field Devices in Loop Power Multi-Drop Mode
For proper HART communication the Wired-HART network requires a 250 Ohm terminating
resistor. When configured for LOOP POWER, the terminating resistor must be hard wired into
the system as shown in Figure 8. The HART terminating resistor must be located in series with
either power source terminal. The location of the HART terminating resistor will not affect the
wiring shown in Figure 8. To operate in this mode the Device Description (DD). parameter
FIELD DEVICE POWER CONTROL must be set to the OFF position which is the factory default
setting.
Figure 8 is a simplified representation of this LOOP POWER multi-drop configuration. The
DIRECT POWER, black lead wire, is not required for this configuration and is not shown. The
EARTH Grounding connection is not shown.
VECTOR V1100 with HART Field Devices in DIRECT POWER Multi-Drop Mode
When configured for DIRECT POWER, the HART terminating resistor requirement can be met
by either by physically wiring a resistor into the system or by using the VECTOR V1100 internal
terminating resistor. The VECTOR V1100 provides a switchable resistor connecting a 250 Ohm
resistor between the HART, yellow lead wire, and RETURN white lead wire. To use the VECTOR
V1100 internal resistor you must properly configure the Device Description (DD) parameter
FIELD DEVICE POWER CONTROL to the - ON setting.
Figure 8 Loop Power Multi-Drop Configuration
VECTOR V1100 Wireless Adapter
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