[gmx-users] pdb2gmx and the terminal residue

[Brett]

Dear All,
 
For the pdb2gmx, if I will not assign charges to the N-terminal residue and C-terminal residue, I need to use pdb2gmx -ter, or I need to use pdb2gmx -[no]ter?
 
In addition, whether there will be charges at the  N-terminal residue and C-terminal residue has relation with the force field used,  am I right?
 
Brett