Siemens SIMATIC TIWAY 1 - Manual (Page 92)

HOST COMMAND SET REFERENCE
UNILINK HOST ADAPTER 5–7
USER MANUAL
5.3 BASE HIU COMMANDS
The Base HIU commands are backward compatible with the original commands
for the TIWAY I Host Adapter. These commands cause a direct network request
to be issued to connect and disconnect secondaries, send data to and from
secondaries, and read secondary statistics. Your applications software must
wait for a response to be returned before issuing another command if you are
using the NITP protocol. If you are using the BDLC protocol, you can have up to
two outstanding transactions before the adapter will return the Receiver Not
Ready (RNR) BDLC control frame. These commands are listed below.
D Send Network Data — 01
D Broadcast Network Data — 02
D Poll Secondary — 03 (Available only in MHIU/EHA mode)
D Connect Secondaries — 04
D Disconnect Secondaries — 05
D Read Secondary Log — 06
D Read Secondary Diagnostics — 07
D Read Adapter Diagnostics — 08
These commands will not be accepted by either the hosted or the stand-alone
Network Manager modes.