Rockwell Automation 1758-RTU202 DataSite Software User Manual FRN 1.2 - Manual (Page 24)

Publication 1758-UM002D-EN-P - October 2010
24 DataSite Configuration Settings Utility (DS Settings)
Master/Slave State
The serial port scan block can be configured in the master state to acquire data
from the slave serial communication equipment connected in a certain time
interval. In the slave state, the DataSite controller can receive commands from
the host, generate and return response message. For more information, see the
Configuration Example on page 50 .
Timeout
In the master state, timeout is the maximum length of waiting time after a
command is sent. No new commands are sent while waiting for a response. If
no response is received after timeout, an error message box will be displayed to
inform you. You will then be prompted to send a new command.
Timeout is not applicable in other states.
Delay Time
In the master state, delay time is the maximum length of waiting time for the
next send command after one send/receive cycle is completed. This setting
can help prevent communication errors caused by a slower response of the
slave communication equipment connected.
In the slave state, delay time is the maximum length of waiting time for a
response to be returned after a command is received. This setting can help
prevent communication errors caused by a slower response of the master
communication equipment.
TIP
Verify the protocol setting. If you set the protocol as
"None", the scan and the trigger scan function blocks will
not run properly even if the Master/Slave state is set
correctly.