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12. Connecting to a computer
The analyzer can be connected to a computer using a USB cable.
Measured values are transferred to the PC via a virtual serial port. If you have not installed
a suitable driver for the virtual serial port on the USB, use the free driver provided by the
manufacturer of the USB chip used in the analyzer. This driver can be downloaded from the
Internet at http://www.ftdichip.com/Drivers/VCP.htm. The specific driver can be selected from
the VCP (virtual com port) category, depending on the PC and operating system used. Use the
instructions attached with the driver to install it.
Data transfer must be activated in the analyzer by the option
Menu/Preferences/Send Data to
USB = On
.
Any terminal emulation utility can be used for data reception; for instance HyperTerminal is
sufficient for Microsoft Windows. This utility is included in the basic Windows installation.
The measured data are transferred in the text mode. Every second, the analyzer transmits data
in the following format:
He xxx.x O
2
yyy.y CR LF
where xxx.x is helium content in percent,
where yyy.y is oxygen content in percent,
CR is the ASCII carriage return symbol (decimal 13, hexadecimal 0D),
LF is the ASCII line feed symbol (decimal 10, hexadecimal 0A).
If there is an error in the measurement, the faulty entry is replaced with asterisks in the
following form: ***.*.
Sent data are available also at the rear connector. The output is in serial form in the format
8N1 (8 bits, no parity bit, one stopbit), speed 115200 bit/s, TTL level. Connector pinout is shown
in the appendix.
Summary of Contents for HE/02
Page 1: ...MANUAL He O2 Analyzer ...
