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VS Series Helium Mass Spectrometer Leak Detectors
A.2 Communicating with RS-232
The RS-232 Protocol is intended for diagnostic purposes and initial set-up inquires. The
RS-232 connection is located on the rear D-sub 9-pin connector.
The leak detector RS-232 port is not an interrupt-driven port. It is configured as DTE
(Data Terminal Equipment), therefore the leak detector's RS-232 Protocol cannot be sent as
strings.
Windows 95 and later versions contain a serial communications program called
HyperTerminal, a useful tool in establishing communication between the leak detector and
a PC.
A.2.1 Windows HyperTerminal Set-Up Instructions
To set up Windows HyperTerminal:
1. Click Start.
2. Select Programs > Accessories > Communications > HyperTerminal.
3. Double-click Hypertrm.exe.
The Connection Description dialog box appears.
4. Enter a name and choose an icon for the connection, for example: leak detector RS-232.
5. Click OK.
The Connect To dialog box appears.
6. Select a COM port from the Connect Using: the pull-down list.
The Com Properties/Port Setting dialog box appears.
A-2
When programming with virtual instrumentation programs such
NOTE
as LabView, TestPoint, or Visual Basic, try one the following two
methods:
❑
Transmit the intended command one character at a time
with a minimal delay time of 50 milliseconds between each
character. Terminate the command with a carriage return
(CR).
❑
Transmit the intended command one character at a time.
Wait for an echoed response from the leak detector before
transmitting the next character. Terminate the command
with a carriage return (CR)
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