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TELEVAC
INSTRUMENT MANUAL
VACUUM GAUGE MODEL MM200
DATA OUTPUT
"Annn<cr>"
"BO<cr>"
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1. Automatically output periodic readings from any selected number of the
sensors. Where "nnn" determines the rate at which data is outputted and is
any number from 001 to 255. Note that three digits must be sent including
lead zeros. All marked stations (see below) shall have their readings output
at the end of "nnn" loops of measuring all the station that are installed. The
time between outputs is approximately 0.11*nnn*(the number of stations that
are installed in the modular unit, no matter how many stations are having their
data outputted). This feature is not available in the burst mode.
The data output is in the same format as for the "Rx<cr>" command below,
except that where more than one station is outputted, the outputs are
separated by spaces. The last (marked) station value output is followed by a
carriage return. For example if eight stations are installed, stations 1, 4, and 7
are marked, and the command "A010<cr>" is sent.
Approximately every 8.8 seconds the modular unit would output something
like:
"1=1.23+3U 4=4.50+1U 7=1.10-5T<cr>"
2. Output data in the burst mode. This command causes an uninterrupted dump
of the data of all installed sensors. The data is stored in RAM so there is no
need to wait for any sensors to be measured for a response from this
command.
The normal format of the data is four ASCII characters for each sensor starting
with the lowest numbered station up to the highest numbered station in
sequence. If a sensor is inactive for some reason, one or two letters are sent,
instead of the four digits, to indicate the status of the sensor.
For all sensors the format is the same, three significant digits and an exponent.
There is an implied decimal point between the first and second digits, and an
implied sign for the exponent. The sign can be
positive or negative depending upon the sensor. There are no delimiters in
the data stream. If an exponent goes to ten an "A" will be sent for the
exponent. For an exponent of eleven, a "B" will be sent.
If a resident 3D or 3E is present several special codes are used. If the 3D or
3E has been turned "OFF" via RS232, an "R" will be sent instead of the four
digits. If it has been shut off due to going over
MM-200_im REV M
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