Siemens SIMATIC TIWAY 1 - Manual (Page 96)

HOST COMMAND SET REFERENCE
UNILINK HOST ADAPTER 5–11
USER MANUAL
5.3.3 Poll Secondary — 03
The POLL SECONDARY command is issued to collect the responses to the
broadcast command or a SEND NETWORK DATA command that timed out in
the Network Manager (NM). This command is only valid for an adapter
configured as an MHIU in EHA mode.
Command: 03 aa
Response: 03 aa pppp...
Usage: OPERATION
Modes: MHIU/EHA
Parameters:
aa The secondary address being polled.
pppp The TIWAY I Primitive data response. This parameter begins
with the length field of the Primitive.