Detcon 700 Series Remote Sensor/Alarm Relay Module With HART Interface - Manual (Page 14)

700 HART-RAM I.M.
3.5 Signal Output Check
Signal Output Check provides a simulated 4-20mA output. The simulation allows the user to conveniently
perform a functional system check of the entire safety system, and can be initiated at the HART-RAM. This
signal output simulation aids in performing troubleshooting of signal wiring problems.
This menu item appears as: “Signal Output Check”
.
From the “Signal Output Check” text scroll, hold the magnet over PGM1 (©) or PGM2 (ª) until the arrow
prompt appears and then hold continuously for an additional 3 seconds. Once initiated, the display will
continuously scroll “Simulation Active” until the function is stopped. During simulation mode, the 4-20mA
value will be increased from 4.0mA to 20.0mA (in 1% of range increments at a 1 second update rate) and
then decreased from 20.0mA to 4.0mA.
NOTE: Signal Output Check stays active indefinitely until the user stops the function. There
is no automatic timeout for this feature.
To end simulation mode, hold magnet over PGM1 or PGM2 for 3 seconds. The display will revert to the
“Signal Output Check” text scroll.
The user can then choose to either: 1) move to another menu item by executing a momentary hold, or 2)
return to Normal Operation via 5 second automatic timeout.
4. HART Interface
The HART-RAM module provides an interface for a Model 700 gas sensor to a HART-enabled Network.
HART technology is a master/slave protocol which allows a HART Master, such as a control system, to
monitor the operation of the HART-RAM, and the Model 700 sensor attached to it. The HART-RAM
functions as an intelligent HART Slave on the Network.
The HART-enabled host interfaces with the mA output of the HART-RAM which contains the HART signal.
Power is provided through the 6-pin terminal block (labeled IN) located on the terminal board. (Figure 9).
NOTE: The 4-20mA signal from the HART-RAM must be connected to a load resistor to
operate properly. If this signal is not terminated properly, the HART-RAM and the HART
Interface will fail to work properly. Normal termination is accomplished by connection to the
host device, which will have the correct load to terminate the signal properly.
700 HART-RAM I.M. Rev. 0.0 Page 10 of 24