Set The Jumpers For Hart/De; Setting Failsafe Direction And Write Protect Jumpers - Honeywell ST 800 Quick Start Installation Manual

SET THE JUMPERS FOR HART/DE

Setting Failsafe Direction and Write Protect Jumpers

The SmartLine Pressure Transmitter
(DE or HART) provides two jumpers
to set the desired failsafe action and
Write Protect option. See
The top jumper on the electronics
module sets the Failsafe direction.
The default setting is up-scale
failsafe.
Up Scale drives the loop to a value
greater than 21mA while Down Scale
drives the loop to a value less than
3.8mA.
You can change the failsafe direction
by moving the Failsafe Jumper (top
jumper) to the desired position (UP
or DOWN).
If your transmitter is operating in DE
mode, the upscale failsafe action will
cause the transmitter to generate a
"+ infinity" digital signal, while a
downscale failsafe will cause the
transmitter to generate a "– infinity"
digital signal.
The bottom jumper sets the Write
Protect. The default setting is OFF
(Unprotected).
When set to the ON (Protected)
position, Changed configuration
parameters cannot be written to the
transmitter.
When set to the OFF (Unprotected)
position, Changed configuration
parameters can be written to the
transmitter.
December 2016
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Quick Start Installation Guide
SmartLine Pressure Transmitter
ATTENTION: Electrostatic
Discharge (ESD) hazards.
Observe precautions for
handling electrostatic sensitive
devices
Action
Turn OFF Transmitter power.
Loosen the end-cap lock, and
unscrew the end cap from the
Electronics side of the
Transmitter housing.
If applicable, carefully depress
the tabs on the sides of the
Display Module and pull it off.
If necessary, move the
interface connector from the
Communication Module to the
display module to provide the
preferred orientation of the
display module in the window.
Set the Failsafe Jumper (top
jumper) to the desired action
(UP or DOWN). And the Write
Protect jumper (Bottom
jumper) to the desired
behavior (Protected or
Unprotected) See Table for
jumper positioning.
Screw on the end cap and
tighten the end-cap lock.
Turn ON Transmitter power.
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