Revision 1
STT700 Temperature Transmitter
User’s Manual
Page 27
5.2.2. HART Communicator Model 375, 475 or MC Toolkit FDC for
HART 7 Models
Connect the HART communicator by attaching the leads in parallel with the input (24V) terminals of
the device. HART communication consists of a high frequency carrier superimposed onto the 4-20
mA signal. The HART transmitter transmits by modulating the 4-20 mA DC loop current with a 1
mA peak to peak (p-p) AC current signal.
Supported Commands
Read/write ID
Select Dual Mode TC/TC, RTD/RTD
Select sensor type
Select PV/SV units
Select damping time
Set LRV and URV
Read URL and LRL
Read analog output
Read Sensor1 and Sensor2
Read % Output
Read Process Value (PV)
Read Cold Junction (CJ) Value
Read fail-safe direction
Set 0% and 100% output calibration
Force output current
Enable/disable latching
XS Delta detection ON/OFF
Set Delta Alarm
Read Delta
Match PVs
Read device status
Set/clear write protect
Select Loop Control Mode
– Average, Difference, Sensor1, Sensor2, Redundant and Split-
Range
Lock/Unlock device
Read/Write Long tag
Read/write message, descriptor, date
Read/Write polling address
Read/Write loop current mode
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