<3. Parameter Setting >
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IM 01C50T01-02EN
3.5.10 Multidrop Mode
“Multidropping” transmitters refer to the connection
of several transmitters to a single communication
transmission line. Up to 63 transmitters can be
connected when set in the multidrop mode. To
activate multidrop communication, the transmitter
address must be changed to a number from 1 to 63.
If it sets to multidrop mode, in order to transmit all
the data in digital one, it is necessary to change a
setup of the analog output signal of 4 to 20 mA.
Setting of Multidrop Mode
(1) Polling address
• Procedure to call up the display
Device setup → Detailed setup → HART setup
→ Poll addr: Enter the number from 1 to 63.
NOTE
When the same polling address is set for
two or more transmitters in multidrop mode,
communication with these transmitters is
disabled.
(2) Analog Output Signal Setting
Set Disabled to Loop current mode and fix an
analog output signal to 4mADC. It becomes
impossible in this case, to also use a burnout
output. However, in the case of the application
which receives and operates an analog output
signal, an analog output signal can be used for
one loop. In this case, set Enabled to Loop current
mode.
• Procedure to call up the display
Device Setup → Detailed Setup → AO Setup →
AO Basic Setup → Loop current mode →
Enabled: Loop current mode is enabled
(4 to 20mA output)
Disabled: Loop current mode is disabled
(4mA fixed)
(3) Enabling the Multidrop Mode of
Configuration Tool
About the procedure to call up the Polling display,
please refer to the User’s Manual of each
configuration tool.
(4) Communication when set in multidrop
mode
• The HART configuration tool searches for a
transmitter that is set in multidrop mode when
it is turned on. When the HART configuration
tool is connected to the transmitter, the polling
address and the tag will be displayed.
• Select the desired transmitter. After that, normal
communication to the selected transmitter is
possible. However, the communication speed
will be slow.
(5) Release the multidrop mode
To release multidrop mode, call up the Poll addr
display and set the address to “0.” Return Loop
current mode to Enabled.
3.5.11 Sensor Matching Function
This function is available only when optional
specification /CM1 is specified. Significant
temperature measurement accuracy improvement
can be obtained using a temperature sensor that is
matched to a transmitter.
(1) Sensor Matching function
Applicable sensors: Pt100, Pt200, Pt500 and Pt1000
The properties of the RTD sensor for the YTA
comply with the standard specified in IEC60751.
Although their variations are within the range
allowed by the standard, they may cause
measurement errors. The Sensor Matching
function improves the precision of temperature
measurement by programming the Callendar-Van
Dusen constants, specific numbers defined for
each RTD sensor, into the transmitter.
NOTE
Before setting the Sensor Matching function,
perform the Sensor Type to “Calibrated RTD”.
(see 3.4.1)
