fix srd

If particles composed of frozen wall are not defined as solute particles. Could not srd particles do interact with wall’s particles?
If i use fix srd command in my input script, group of srd particles just can do interact with particles that are set in big group? and particles that are set in another group anywhere in input file can not do interact with srd particles?

fix ID srdgroup−ID srd N groupbig−ID Tsrd hgrid seed keyword value …

For the fix srd command, SRD particles only
interact with what you define as "big", whether
they are part of a frozen wall or not.