The RS232 connection is automatic, so no need for user name or password. A reboot of the receiver may be needed to see the data flow, unless you patiently wait for something to be shown.
Connecting to a fta receiver using RS232 has become nothing short of a complicated mess as shown in the post #1 attachment. There are several cables available that are RJ12 to RS232, but they are not all wired the same. Not many computers have a RS232 terminal, so you have to use a USB to RS232 adapter which has its own set of problems or difficulties.