I obtained this information from an old, unofficial Rocklink forum that no longer exists, but it was still possible to access the old post through the Wayback Machine.
How did they discover these parameters? I don't know; there's not even a mention of it in the Rocklink software manuals.
Post Source (by S slearl): https://web.archive.org/web/20120828194024/https://roclink.wordpress.com/2010/01/13/command-line-options/
Allows multiple instances of ROCLINK 800 to run at the same time.
C:\Program Files\ROCLINK800\Roclink.exe /multi
Specifies the device address to use when connecting to a ROC.
C:\Program Files\ROCLINK800\Roclink.exe /LOGIN:LOI:1000
Connects to a ROC using the specified PC Comm port number, baud rate, parity (N, O, or E), data bits (8 or 7), and stop bits (1, 1.5, or 2).
If any argument is not specified, the associated default value will be used. (Defaults are 1:9600:N:8:1)
C:\Program Files\ROCLINK800\Roclink.exe /COMM:3:19200:N:8:1
Connects to a ROC via Ethernet using the specified IP address and IP port number.
C:\Program Files\ROCLINK800\Roclink.exe /TCPIP:155.177.78.1:4000
Save the copy of the parameters as a .800 file.
C:\Program Files\ROCLINK800\Roclink.exe /SAVE:C:temp/configs:MyRoc.800
Selects the specified menu item.
The optional logical point number argument, if appropriate for the specified menu item, may be used to specify a specific point number between 1 and the number of logical points.
If the argument is not specified, the default value of 1 will be used.
C:\Program Files\ROCLINK800\Roclink.exe /LOGIN:LOI:1000 /TCPIP:10.10.220.1:4000 /MENU:Configure:IO:AI Points:3
Be sure to place this before any attempt to login, otherwise the the default 240:240 will never be overwritten
C:\Program Files\ROCLINK800\Roclink.exe /MULTI /LOGIN:LOI:1000 /ADDRESS:240:240 /COMM:1:115200:0:8:1
Be sure to place this before any attempt to login, or the default 2 seconds and 3 retries will be used.
C:\Program Files\ROCLINK800\Roclink.exe /MULTI /LOGIN:LOI:1000 /ADDRESS:240:240 /TIMEOUT:2:1 /COMM:1:115200:0:8:1