ProSoft Technology MVI56E-GSC/ GSCXT - Manual (Page 82)

Reference MVI56E-GSC ♦ CompactLogix or MicroLogix Platform
User Manual Enhanced Generic ASCII Serial Communication Module
Page 82 of 140 ProSoft Technology, Inc.
May 9, 2014
Read-Only Devices
Read-Only devices are those that only receive data from the module. An
example of this type of device is a printer. The printer will generate output or be
controlled based on the data it receives on its communication port.
Ladder logic is used to construct the write blocks to be sent to the module. When
the module receives a new write block containing data, it will transmit the data
out the port. The Block Sequence Number used in the write block should be the
one received on the last read block.
The data flow diagram for a read-only device is shown below: