[comp.protocols.misc] X.21 bis VS RS-232-C

rjl@sfsup.UUCP (R.J.Lewis) (03/16/88)

As I understand it, there is a difference of one lead in RS-232-C and
X.21 bis.

Is this correct?  If so, would anyone be able to tell me what lead it
is that differs and whether it is an output or input lead.

Thanks.  Any help would be greatly appreciated.

Reg Lewis
...!{ihnp4,allegra,mtune}!attunix!rjl