9
Direct and Addressable Line text
The FMC-60 system measures data on all active sensors.
Direct sensors are done sequentially but addressable sensors send their data periodically
when available (every few seconds).
Each sensor has a text description (stored on the main pcb, not in the sensor) which
describes physically where it is in the system and this text appears on the LCD as the
most recent measurement is displayed. Using Engineering mode, this text can be altered
from the default text to something more meaningful.
Editing this text is either manual using buttons and the LCD or by sending a text file from
the PC. The latter is much faster and is preferred. The manual mode is activated from
Engineers menu 17 which presents the direct 4-20 channels text first followed by the
Addressable text.
Pr (4) or - (2) changes which channel is to be altered and pressing UP (1) button
enters the text editing mode for this channel. The + and - buttons now move a cursor
under the text and UP and DOWN alter the character at this cursor position. When editing
is finished for this channel, press SELECT to exit the editing which returns to allow
changes on another channel by pressing the UP button again. Alternately pressing
SELECT will exit the direct 4-20 channel text and enter the Addressable channel text
selection. Again the buttons are used in exactly the same way to change the text
description for networked Addressable sensors.
SELECT when pressed will exit the manual mode and save the text changes in non
volatile memory on the main PCB and return to the Engineers menu.
See also DATA to and from a PC using HyperTerminal which allows a much quicker
method of editing using a PC.
Holding the Display
As the sequence of displaying the gas occurs, it may be required to stop on a particular
channel for maintenance.
This can be achieved using the + (4) button on the front panel which when pressed will
hold the current sample for 999 seconds. A countdown is displayed on the LCD showing
that hold is in progress. At the end of this time normal display sequencing will resume.
The gas values displayed on the LCD during hold are still the current live readings from
the sensors.
Hold can be removed at any time by pressing the + (4) button for a second time.
As the sequence of displaying continues it is sometime required for maintenance to
choose another sensor for display and this can be achieved using UP (1).
This button when pressed terminates the current display it moves to the next displayed
channel and if pressed continuously, this button will step through all available sensors
When the desired channel is reached and the button released, press + (4) to hold this
display for 999 seconds. Pr (4) will release the system back to normal.
