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Technical Information
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.
When programming with virtual instrumentation programs such as LabView,
NOTE
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).
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.
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.
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Agilent Helium Leak Detector User Manual
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