Dataman S4 - Manual (Page 94)

DATAMAN S4 MANUAL
94 ASCII Format
must press ESCape when the transmission is
ended.
NOTE Computers will not send a BINARY
file through their serial interface, using PIP
or COPY routines, unless you add a suffix:
COPY needs /B, PIP needs [O]. Otherwise
the transmission is aborted if an end-of-file
(1A) character is seen.
BINARY reception is useful to check other file
formats: every character that is sent appears in
S4's RAM, so you can see what is really being
received, including carriage returns, line feeds
etc.