4-25Lasair® Pro Aerosol Particle Counter Operations Manual
Chapter 4 : Connections
Method 2: Modifying Network Settings with Serial Commands
This method takes advantage of a Microso Windows feature called Automatic Private IP
Addressing or APIPA. APIPA allows a PC to automatically assign itself an IP address even
when no DHCP server is present to provide an address to the PC. Translated this means
that by assigning the right address to an instrument, it will talk one to one with a Windows
machine without setting an address on the Windows machine. The address range of
169.254.0.1 through 169.254.255.254 is reserved for APIPA.
1. Connect the Lasair Pro counter to a PC using a USB Micro B serial cable.
2. On the PC, open your terminal emulation soware.
3. Set the instrument addresses as follows (see Appendix B):
IP address 169.254.0.1 Use command “set ip”
Mask 255.255.0.0 Use command “set mask”
Gateway 0.0.0.0 (or blank) Use command “set gate”
4. Aer setting the addresses, use the write command to save the addresses. The
instrument will reboot and apply the new address settings.
5. Attach a network cable between the PC and the instrument.
6. In your internet browser, type the IP address of the Lasair Pro. If security is
enabled, you will be prompted to enter credentials. If not, you will see the HOME
screen of the Lasair Pro. Functionality is identical to the touchscreen.
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