USER MANUAL APS 6.0

Preface
Advanced Programming Software User Manual
13–22
If you: Then:
went online this procedure is finished
did not go online
1. Repeat steps 4-6.
2. Set F4 Use Modem to NO.
3. Repeat steps 8-9 on page
13-21.
To switch the channel back to user mode, follow the steps above, but for the modem
initialization string (step 7), enter
<your mode attention
character><your user mode character>.
The default is \1bU.
Considerations When Communicating as a DF1 Slave on
a Multi-drop Link
When communication is between either APS and an SLC 5/03 processor or between
two SLC 5/03 processors via a slave-to-slave connection on a larger multi-drop link,
the devices depend on a DF1 Master to give each of them polling permission to
transmit in a timely manner. As the number of slaves increase on the link (up to
255), the time between polls for APS or the SLC 5/03 processor also increases.
Additionally, the amount of time between polls to any one APS and/or SLC 5/03
processor also increases. This increase in time may become lar ger if you are using
low baud rates.
As these time periods grow
, the following values may need to be changed to avoid
loss of communication:
• APS – poll timeout and reply timeout values
• SLC 5/03 processor – poll timeout and edit resource/file owner timeout values
To change the poll timeout and reply timeout values for APS, do the following:
1.
At the main menu press [F2] Online Configuration, then
[F2] Select Device until “Half-Duplex Slave” is displayed.
2.
Press [F7] Device Configuration and then [F10] Half Duplex.
3. Change the poll timeout and reply timeout values using the appropriate function
keys.
4.
Press [F9] Save to File, then [ESC], [ESC], [ESC] and return to the
main menu.