Copyright 2013 Baker Hughes Company.
English–DPI
620G Instruction Manual | 77
HART® Menu Operations
9. HART® Operations
The DPI
620 Genii can communicate with devices that use the HART® protocol as follows:
•
The Universal and Common Practice commands specified in HART® revision 5 to
7.
•
Devices that support Device Descriptions (DD).
This chapter includes procedures to use the HART® functions available in the calibrator.
9.1 HART® Menu Operations
The HART® uses a digital signal on top of a standard 4
-
20
mA current loop to transmit data to
and from a HART® enabled field device. Typical operations include the following:
•
Read the primary variable and the analogue output.
•
Read the device serial number, type and supplier.
•
Retrieve calibration data (upper and lower range values, sensor limits, calibration date).
•
Do status and fault-finding checks.
•
Change the device configuration (range, units, damping).
The DPI
620 Genii can be used to communicate with other HART® field devices:
•
As a Primary Master the DPI
620 Genii starts and controls all communications. The field
device (slave) uses each command from the master device to make a change and/or send
data back.
•
As a Secondary Master the DPI
620 Genii is connected into an existing HART®
communications network. The Secondary Master communicates with the field device in
between Primary Master messages.
9.2 Start-up
HART® communication is started by selecting the HART®
icon from the
Dashboard.
Tasks can be selected for CH1, CH2, P1, P2 and external sensor. Refer to Section
3.
HART® can also be selected from the Calibrator function by selecting the COMMUNICATOR
channel from Custom Task Settings.
9.3 HART® Connections
Before setting-up the electrical connections between the HART® device and the DPI
620 Genii
get the correct connection scheme (Refer to DASHBOARD > HELP).
9.3.1 Power Supply from the Calibrator
A 24
V or 28
V loop power can be supplied to the HART® device using the CH2 Current (24
V or
28
V) measure function.
