37
Creating and Deleting Gas Mixtures with COMPOSER™ using RS-232 or RS-485
No
te:
All commands must be prefixed with the unit ID letter. The unit should
not be in streaming mode.
You may create and store up to 20 gas mixtures containing up to five
constituent gases each. The constituent gases must be chosen from the existing
list of gases installed on the device (which may vary model to model). Please
see pages 40 – 47 for lists of gases and their corresponding gas numbers.
Create a Gas Mixture
To create a gas mixture, enter a single-line command according to the following formula:
[Unit ID] GM [Gas Name] [Gas Mix Number] [Percent 1] [Gas Number 1]
[Percent 2] [Gas Number 2] …etc. etc.
Notes:
Do not type the brackets. There should be only one space between
all items. Any percentages less than 1, should have a leading zero before
the decimal (i.e. 0.25 for .25%). Trailing zeros are not necessary but they are
allowed to help visualize the percentages on screen (as in the example). The
sum of all percentages must be 100.00 otherwise an error will occur.
Here is an example of a three gas mixture for a new gas called “MyMix1”
(50% O2, 49.5% Helium, and .5% Neon), stored in user location #236, where the
unit ID of the device is “A”:
A GM MyMix1 236 50.00 11 49.50 7 0.50 10 <ENTER>
Gas Name
: Name your mixture using a maximum of 6 characters.
Gas Mix Number
: COMPOSER™ user mixes have Alicat gas numbers between
236 and 255. You can assign any number in this range to your new mixture. If
another mixture with the same number exists, it will be overwritten, even if
that gas is currently selected on the unit. If you enter a 0 here, the new mix
will be assigned the next available number between 236 and 255.
Percent 1
: The percentage of the first constituent gas. The percentage of each
constituent must be between 0.01 and 99.99. Values entered beyond two
decimal points will be rounded to the nearest 0.01%.
Gas Number 1
: The Alicat gas number of the first constituent gas.
Percent 2
: The percentage of the second constituent gas. Values entered
beyond two decimal points will be rounded to the nearest 0.01%.
Gas Number 2
: The Alicat gas number of the second constituent gas.
Additional Gases
: (Optional) The above pattern of [Percent] + [Gas Number]
may be repeated for additional constituent gases (up to a total of five).
Upon success, the unit ID (if set) is returned followed by a space. The number
of the gas mixture is then returned, followed by the percentages and names
of each constituent in the mix. If the gas mix is not successfully created, a "
?
"
is returned, and you must start over.
Delete a Gas Mixture
To delete a gas mixture, enter:
[Unit ID]
GD [Gas Number]:
The number of the COMPOSER™ user mixture you
wish to delete from the unit
Only COMPOSER™ user mixtures can be deleted with this command.
On success, the unit ID (if set) is returned followed by a space and the number of
the gas deleted. If the gas is not successfully deleted, a "
?"
is returned.
