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where can I find a manual for Passcal software ?

Your Question: 
I downloaded the Passcal software rpm 2010-264 build, converted it in .deb and installed it on my virtual machine. No problem. But the only documentation I can find on my computer is the man pages in /opt/passcal/man/manl, and I don't manage to find a software manual although the field manual hints at its existence. Where could I find such a manual please ?

There is no 'manual' specifically. Each program has a manual page or built in help. When you install the PASSCAL software the binaries will get installed in /opt/passcal.bin. You can then look at the man pages for each program, for example 'man segycut'. Other programs may have built in help that is usually accessed through the -h switch, for example 'rt2ms -h'.