Rockwell Automation 2755 2D Hand-Held Scanner - Manual (Page 158)

F–6 DTAM t Plus DeviceNet t Application
Publication 2755-6.7
DeviceNet Operation
The DTAM Plus DeviceNet operates as a Group 2 Server on the
DeviceNet network. It supports the Unconnected Message Manager
(UCMM). The DTAM Plus DeviceNet implements the predefined
master/slave connection set, operating as a slave device. It does not
initiate communications except for a Duplicate Node Address check
on power-up.
The DTAM Plus DeviceNet supports the polled I/O method of
exchanging data with a master, in the following sequence:
1. The designated master writes an output image to the DTAM Plus
DeviceNet using the Poll Command message.
2. The DTAM Plus DeviceNet responds to the poll command by
returning an input image back to the master in a Poll Response
message.
Note: The size of the input and output images (also referred to as
files) are individually configurable from 0 words to 121 words
each, to optimize DeviceNet network loading.
3. The DTAM Plus DeviceNet application program interacts with
data contained in the input and output files.
4. Data Display screens are used to view input and output data.
5. Data Entry screens are used to modify input and output data from
the scanner.