Siemens SIMATIC TIWAY 1 - Manual (Page 99)

HOST COMMAND SET REFERENCE
UNILINK HOST ADAPTER 5–14
USER MANUAL
5.3.6 Read Secondary Log — 06
The READ SECONDARY LOG command returns the list of secondaries that
are logically connected to the HIU.
Command: 06
Response: 06 [aa]
Usage: OPERATION
Modes: MHIU/EHA, HIU/EHA, MHIU, HIU
Parameters:
aa The secondary addresses currently connected to the HIU. If no
secondaries are connected, the value returned will be 00.