This section describes how the Advanced Modbus driver scans (polls) Modbus Direct controllers for data. Use this section in conjunction with the advanced drivers scanning information (see Scanning Direct Outstations).
This section includes information on:
Also see Specify how any Scanning Gaps are Handled.
(The way in which Geo SCADA Expert retrieves data from controllers that communicate via PSTN differs to the way in which it retrieves data from controllers that have a permanent (‘direct’) connection to the server. For information on scanning PSTN controllers, see Retrieving Data from PSTN Outstations.)