Siemens SIMATIC TIWAY 1 User Manual page 31

OPERATION AND APPLICATION
2.7.2 Primitive 03 Response
The Primitive 03 response will be returned as follows.
LLLL 03 HH DDDD EEEE FFFF GGGG IIII JJJJ KKKKKKKK
Where LLLL is the Primitive length,
HH will be 00 indicating that it is operational and
performing instruction execution,
DDDD will be 007E indicating that the device type is
an HIU,
EEEE, FFFF, GGGG, IIII, JJJJ will be 0000,
KKKKKKKK will be 00000000.
2.7.3 Primitive 04 Response
The Primitive 04 response will be returned as follows.
LLLL 04 NNNN MM EE FF GG
Where LLLL is the Primitive length,
NNNN will be 010E and indicates the maximum Primitive
length supported,
MM, EE, FF, GG will be 00.
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USER MANUAL