Siemens SIMATIC TIWAY 1 - Manual (Page 38)

OPERATION AND APPLICATION
UNILINK HOST ADAPTER 2–28
USER MANUAL
02 0002 11 00
02
03 01
03 01 0002 11 01
03 02
03 02 0002 11 01
03 03
Issue Broadcast command
Accepted response
Poll address #1
Address #1 response
Poll address #2
Address #2 response
Poll remaining addresses
Example 2–1 BROADCAST/POLL Example
2.9.3 Retrieving Secondary Statistics
The UNILINK Host Adapter maintains network statistics for the logically
connected secondaries on the network. This information is not essential for
normal operation, but can be useful for identifying problems.
The first statistical command is the READ SECONDARY LOG command, code
06. When this command is received, the UNILINK Host Adapter will respond
with the command code followed by the list of secondary device addresses that
are logically connected. If no secondaries are connected, the list will contain one
byte with a value of 00.
The second command is the READ SECONDARY DIAGNOSTICS command.
This command returns statistical counters for the network HDLC
transmissions and errors. Along with the command code and secondary
address, there is a reset statistics counters parameter. The counters are not
automatically reset when their maximum value is reached. The reset
parameter allows your applications software to reset the counters to start a
baseline measurement.