‘Hi point’ to set a gas value above which the
trip is active. If there is no reading shown
under this column on the display, or if the ‘Off’
key is used when setting the low point, this
trip will not respond to high readings.
Note: setting both high and low trip
points will give a range indication.
‘Contacts’ to swap between normally-closed
(‘n/c’) and normally-open (‘n/o’) contact
modes to suit externally connected
equipment. In normally-closed mode, the trip
is fail safe in that power failure, disconnection
or trip becoming active will all open the circuit, generating the alarm.
‘Done’ to save any changes made and return to the previous screen.
Repeat the settings above for each trip to be set.
3.7 RS232C Serial Port
A serial port is available on the rear panel (labelled ‘RS232C’), to which a PC, VDU or other
computer equipment can be connected. The port provides a way of monitoring the readings
remotely, and triggering auto-zero. For connection information see section 2.4.
3.7.1 Protocol
The MGA analyser accepts the following single character commands:
Serial Port Commands
Command
Letter
Function
P Return current gas reading(s) as shown on screen, except for units.
Multiple gas units separate readings with commas. The reading(s)
is terminated with carriage return linefeed.
Z Initiate an auto-zero adjustment. This command will temporarily
freeze the analogue outputs. This command will not result in a
coarse zero adjustment.
3.7.2 Serial Port Settings
The serial port is configured from the front panel. To check or change the serial port settings,
select:
Set Up, Ser. Port
From the main screen menu. The screen will show current settings.
Figure 9 - Setting up a trip
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