Table of Contents
Advertisement
Chapter 4: Operation Mode
4.2 Master Modbus Mode (PLC Link)
This mode sends the decoded barcode with Modbus packaged protocol. User can set the ID of
slave device. Start address: the data were beginning to fill in. Timeout: the slave device should
reply within this period. Retry times: if the slave device do not reply within timeout, DFS150-485
will retransmit the same packet no more than retry times. Finished flag: If the finished flag is set to
one that indicated a packet of barcode has been transmitted.
Out1 will be set to low level (error status), if real retry times is bigger than three times or the time
of ack is too long. Depends on the code length and transmit speed, if the code content is too long,
then the data will shift over back to the first register but as this time system still waiting the ack, it
will no longer to wait the third retry time and cause error. It will be reset to high level (normal status)
when the new barcode is decoded.
The sample of format of decoded barcode, receiving data, and finished (completed) flag are
shown as below.
Figure 10. Master Modbus Mode barcode sample
DFS150-485 2D Fixed Scanner User Guide
4-3
Advertisement
Table of Contents
