Rec-Measured Value Memory; Rs232-Interface - VOLTCRAFT CM-100 Bedienungsanleitung

REC-Measured Value Memory

The measured value memory records the minimum and maximum carbon dioxide
concentration values.
- The REC function can be activated during measurement by pressing the "REC"
(7) button.
- The symbol "REC" now appears in the display accompanied by a beep tone.
- The recording is running. Automatic cutoff is deactivated
- You can view the max values by pressing the "REC" (7) button again. The display
shows "MAX" and the value is loaded from the memory and displayed. Pressing
the button again shows the min value along with the "MIN" in the display. The Min-
/Max display can be exited by pressing the "ESC" (4) button - this returns you to the
"REC" measured value recording. The display now only shows "REC".
- To deactivate the REC function press and hold the "REC" (7) button for approx.
2 seconds. The "REC" symbol disappears.
The recorded measured values are only saved in REC measurement
mode. If this function is ended or the measuring device is switched off, the memory is delet-
ed.
RS232 interface
The measuring device is fitted with a serial interface (11) for exchanging data with a computer. This can
be found on the right hand side under a cover. Open the cover with a pointed object. The interface is in
the form of a 3.5mm mono jack plug socket and requires a compatible data cable, which is an optional
extra.
The data cable has the following components:
Jack plug 3.5 mm mono
Centre contact
External contact
The serial data signal is made up of 16 Bits in the following order:
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
9-pole D-SUB socket for PC
Pin 4
Pin 2
2.2 KOhm resistance is necessary between Pin 2 and
Pin 5 a.
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