This section describes basic operation of the LI-840A.

Installing the PC Communication Software on Your Computer

The software application is shipped on CD. It requires that your computer have an RS-232 serial (COM) interface, and Windows® 7, 8, 8.1, or 10.

An installation menu will start when you insert the CD into your CD-ROM drive. Select Install Software from the menu and follow the instructions. If installation does not start, select Run from the Windows Start menu, and select the LI840Setup.exe file on the CD. When the software has finished the installation procedure, a program icon will be placed in the Programs menu.

NOTE: To remove the software, go to the Control Panel and select Add/Remove Programs (XP) or Uninstall a program (Vista/7). Choose LI840 from the list of programs and click the Add/Remove button. If your computer has the older LI840 software, be sure to use the correct program when configuring the LI-840A.

Setting the Communication Parameters

LI-840A communication parameters are set automatically when the program is run.


The serial cable (null modem) included has 9-pin connectors on both ends; either end plugs into the 9-pin connector (Serial I/O) on the front panel of the LI-840A. Use this cable to interface with your computer's 9-pin serial port. If you want to interface to a computer with a 25-pin serial port, a 9-pin to 25-pin adapter must be used. To connect to a computer with a USB port, a 9-pin serial to USB adapter must be used.

RS-232 Output

Data from the LI-840A can be transferred to a computer for analysis, printing or storage using the RS-232 interface. The LI-840A RS-232 port is configured as Data Terminal Equipment (DTE) with no hardware handshaking, and is bi-directional, meaning information can be transferred both into and out of the LI-840A.

The application software that comes with the LI-840A is used to view data and configure the LI-840A from a PC.