Unzip and unpack the source, then make it. To run:
multimeter -6 [-l] [-i interface] [-h]
The -6 flag makes multimeter communicate at 600 baud, which is required for the 22-805. The -l flag instructs multimeter to loop forever. The -i interface flag will specify which serial port to use, where interface is /dev/ttySX, where X is the number correlating to the desired serial port. Multimeter uses serial port 2 (/dev/ttyS1) by default - if that is the port you are using, you won't need to use this flag. The -h flag brings up a help screen which has additional flags that can be used.
The highest rate the 22-805 seems capable of communicating (at least with the multimeter software) is at one transmission per second.
BYTE) 1 2 3 4 5 6 7 8 9 A B C D E Example 1) D C - 3 9 9 . 9 m V CR Example 2) O H 3 9 . 9 9 M o h m CR