Siemens SIMATIC TIWAY 1 - Manual (Page 87)

HOST COMMAND SET REFERENCE
UNILINK HOST ADAPTER 5–2
USER MANUAL
D All codes and parameters are separated by spaces.
D Optional parameters are surrounded by parentheses, like (aa bb).
D Parameter sequences that may be repeated are surrounded by
brackets, like [aa bb].
D Certain letters designate a specific parameter type used throughout the
command syntax descriptions for easier identification. These are:
d aa — the secondary device address.
d ss — the Source Identification number.
d rr — the reset counters code.
d oo — the option code. Commands may have one or more option
codes.
d pppp... — a TIWAY I Primitive.