Emerson Rosemount 644 Reference Manual page 14

Configuration
March 2021
The transmitter can be configured either on-line or off-line using a Field Communicator,
AMS Device Manager, or the optional LOI (head-mount and field-mount). During on-line
configuration, the transmitter is connected to a Field communicator. Data is entered in
the working register of the communicator and sent directly to the transmitter.
Off-line configuration consists of storing configuration data in a Field Communicator while
it is not connected to a transmitter. Data is stored in nonvolatile memory and can be
downloaded to the transmitter at a later time.
2.4.1 Configuring on the bench
To configure on the bench, required equipment includes a power supply, a digital
multimeter (DMM), and Field Communicator, AMS Device Manager, or a LOI – option M4.
Connect the equipment as shown in
any termination point in the signal loop. To ensure successful HART Communication, a
resistance of at least 250 ohms must be present between the transmitter and the power
supply. Connect the Field Communicator leads to the clips behind the power (+,–)
terminals on the top of the device. Avoid exposing the transmitter electronics to the plant
environment after installation by setting all transmitter jumpers during the
commissioning stage on the bench.
Figure 2-1: Powering the Transmitter for Bench Configuration
A. Field communicator
B. Power supply
C. 248 Ω ≤ RL ≤ 1100 Ω
D. Recorder (optional)
E. Ammeter (optional)
Note
• Signal loop may be grounded at any point or left ungrounded.
• A Field Communicator may be connected at any termination point in the signal loop.
The signal loop must have between 250 and 1100 ohms load for communications.
• Max torque is 6 in-lb (0.7 N-m).
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Head mount and Field mount
C
E
B
A
Figure 2-1. Connect HART
D
Reference Manual
00809-0200-4728
®
Communication leads at
Rail mount
D
C
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E
+
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+
B
A
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