5. HART COMMUNICATION
The CH420L transmitters have a HART communication MODEM
The details of the characteristics with respect to the HART communication are available in the
appropriate Field Device Specification
Resume of the principal communications characteristics:
Manufacturer, Model and Revision
Tecfluid, CH420L, Rev. 0
Device type
Transmitter
Hart Revision
6.0
Device Description available
No
Number and type of sensors
1, external
Number and type of actuators
0
Number and type of host side signals
1, 4 – 20 mA analog
Number of Device Variables
2
Number of Dynamic Variables
1
Mappable Dynamic Variables
No
Number of Common Practice Commands
13
Number of Device Specific Commands
2
Bits of Additional Device Status
12
Alternative operating modes?
No
Burst mode?
No
Write Protection?
Yes
Analog loop electrical characteristics for communications :
Reception Impedance :
Rx
>
8,5 M
ȍ
Cx
<
200 pF
4. PUSH BUTTON INHIBIT AND “WRITE PROTECT”.
The transmitter has a jumper situated behind the display on the left hand side which can
be used to avoid changes in the configuration. When the jumper is removed, the push buttons are
disabled and the HART write protect is activated, thus inhibiting any changes in the configuration.
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